Since monday, there has been a strange 'fart' like smell in the car. We couldn't work out where it was coming from so we sprayed the upholstery with Febreeze to try to remove the smell.

We were at the supermarket this evening and I picked up one of the reusable carrier bags from the car boot. In the bottom of the bag I noticed a pack of mozzarella cheese which had burst open, spilling the cheesy brine all over the inside of the bag.

Mystery solved.

The cheese must have been sitting in the car for over a week. The heat over the weekend will have caused the pack to expand and burst. I rinsed out the bags when we got home, so hopefully that will get rid of the smell.

I'd forgotten that March was an expensive month for the car. The road tax, insurance and MOT were all due.

I took the car for it's MOT yesterday but was told that it needs new tyres. The tread was a bit low but looked more than the 1.6mm minimum depth. I got some new tyres fitted this morning and was amazed at the difference it made. Before, the steering had been quite heavy but I put that down the the car's lack of power steering. With the new tyres, the steering is much lighter. The tread is so deep it feels like you could lost a finger if you poked too deep.

I was driving a hire car today. I don't know whether the University regularly hires automatic cars but that's what I got. It's only the 2nd time I've driven one - I'm more used to a normal manual gearbox. It feels weird driving a car without a handbrake or a clutch, and the sluggishness from a standing start is a bit annoying (although the last point may have been because it was also a diesel).

When I got back this afternoon and returned the car, I got back into my own car to drive home. It then started to feel weird needing to press the clutch. The steering also felt strange - the hire car had very light steering whereas my car doesn't have power assisted steering so it felt very heavy.

While I was out, I heard about an unexploded 2nd World War bomb found in the city centre. Later this afternoon I read about the ring road being closed in an anticlockwise direction, but it was open and moving freely when I drove home. It looks like I got home just in time.

Thanks to the BBC iPlayer, I finally managed to watch the episode of Top Gear where they 'celebrate' 40 years of British Leyland cars. Unfortunately the episode I originally downloaded failed to work - the licence had 'expired' despite having 5 days left - so I had to watch the version with the sign language person 'flapping' in the corner of the screen.

In the episode, the presenters had to go out and buy an old BL car each, and then perform various tasks. They drove to the sites of some of the old factories, but most of them had since been demolished. The only one still in use is now owned by BMW. Others had been demolished and (like Longbridge) were derelict land or had been turned into hotels or offices.

At the site of the old factory in Coventry they commented on how it had turned into a hotel. They complained that there was nothing to commemorate the site of the factory, apart from a few road names (Herald Avenue, Dolomite Avenue). They must have missed the metal plinth which gave some of the history of the site.

The Canley factory has gone the same way as most of the motor manufacturing in Coventry. A lot of the sites have been converted into flats, offices or shops. The Canley site has an industrial estate, a hotel and a Sainsburys. The Peugeot site at Stoke is now flats and offices. The only cars made within Coventry are the Black Cabs, made by London Taxi International, at the factory on Holyhead Road. This factory (tucked behind the BMW/Mini dealership) is opposite yet another shopping centre built on the site of an old car factory - the Alvis Retail Park.

Anyway, back to Top Gear. They took their old cars to a test track and had to drive along a bumpy cobbled road, with a colander of eggs taped over their heads. They scored depending on how how much egg was still in the colander, and lost 'points' for any trim which fell off. The biggest bit of 'trim' lost was the back door from Clarkson's Rover SD1.

Another of the tests was to drive up a 1 in 3 stretch of road, apply the handbrake, and see if the car would stay there. Now 1 in 3 is very steep - lesser gradients make it feel like the car is tipping over backwards. The Rover had great difficulty even getting up the slope. The wheels lost traction and the wheelspin hid the car in huge clouds of smoke.

Back when I lived in Aberystwyth, there was a 1 in 4 road between Waen Fawr and Llanbadarn. At the bottom of the hill there was a T junction and I had to approach it very slowly because it always felt like the car wasn't going to stop. Heading the other way, up the hill, unless I managed to get a good run up I had to take the hill in 1st gear. At the time I only had a Rover Metro with a 1.1 litre engine so it struggled when presented with challenges like that.

We got rid of the Metro a few years ago, but we noticed the address in the back of the handbook was given as 'Canley Road' - the site now occupied by the hotel/industrial estate/Sainsburys. I did a search for the postcode on Google maps but it doesn't exist any more.

Getting back to Top Gear, the tests became more surreal. They filled the cars with water and drove around the track to see which would go the furthest. The surprising winner was an Austin Princess driven by Captain Slow.

Top Gear is at its best when they have the silly games and challenges. Most of the car reviews get very tedious. They tend to be either overexpensive cars being driven fast around the track while being compared with other overexpensive cars, or small/affordable/economical cars being accused of being dull and boring. I can't be the only viewer who gets tired of hearing about the latest supercar with zero relevance to everyday life. It's like a car version of the pathetic Celebrity type of magazine.

Despite these problems, the banter between the presenters is good. The 3-way reviews, where they all go out with similar cars and compare them, tend to be more interesting than the one-off reviews with individual cars. Hopefully they'll continue to do more of the motoring challenges - the one where they had to drive old cars across Africa was one of the better episodes of the series.

My new car insurance starts today, with Emma down as an additional driver so she can get more practice, ready for her driving test in december. She was really excited but I must admit to being a bit nervous at first. My old heap of a car isn't as easy to handle as more modern cars with their power assisted steering, automatic chokes and responsive brakes.

We didn't go anywhere exciting, just to Tesco and back, although we did get stuck on the A45 for a while because the traffic was held up by an accident near the Broad Lane junction.