no worries iceman, ssaunders is convoying with us too. Probz best to see you at South mimms I reckon? At least you can stay on the m25 that way, I believe there will be a few more meeting at mimms too.
Here's a website link that will give the correct sizes for any car. Have a look and go through the options, That should give you offsets and required tyre sizes. http://www.wheelfitment.eu/car/Volkswagen/Golf%203%20GTI,VR6%20(1991%20-%201997)/
It's a good idea to improve comfort, it just means your indicated speed will be wrong. Better to have bigger tyres than to ruin the wheels. I don't think the wheels you've chosen will rub.