And mr hell she won't be on the track in bad weather (not at £150 for a day!) 
Errrr, your username suggests you live in the UK?
Like f*ck you won't go out on track in bad weather - you'll book and pay for the day and it won't matter if it's p*ssing with rain, if you're booked and paid, you'll turn up and go. What will really annoy you is if you go, but then can't go out on the track because the car's misted up and you can't see sh*t because you have no heater or blower.
There was torrential rain during the last day I was at, at Castle Combe. That was in July.
and i say 3 point harnesses, they will be either 3 or 4 and will certainly hold us in the seats beter than standard belts...
No, if they're not mounted properly and you have an off they won't, because if you run the top strap/s down to the rear belt mounts or similar then on impact the belt will force downwards, doing nasty things like compressing your spine, causing more injuries than a 3-point belt would. 4 point belts also won't stop you submarining in the seat, which a 3-point inertia reel will. Oh and if you buy 2" belts they'll concentrate loads on your body far more than a standard seatbelt, doing things like breaking your collarbones in an accident.
Far better to keep the current belts and buy a CG Lock which will hold you in place more effectively and in a far safer manner. After all - VW spent many thousands of Deutsche Marks ensuring the seats and belts in their cars were safe. Only a moron would replace this important safety kit by just bolting in some harnesses using a handy bolt hole or two they found in the car that was used for something else before. You've already stated that you're not morons, so that's OK you won't do that sort of thing, will you?
Maybe before you go tearing off spending that precious budget of yours you should have a read of the relevant sections of the MSA Blue Book. You'll find it all here:
http://msauk.org/site/cms/contentCategoryView.asp?category=609This outlines the safety equipment that is required for various types of motor sport. You may not be competing, but if you take the standards developed through years of experience in motorsport and then apply them to your car, you won't go far wrong. It would also mean if you did decide to compete you wouldn't need to re-work everything you'd done previously.
Play safe, kids.
