Can I fit runflats to my BMW 1 Series?

I have recently purchased a BMW 118d cabriolet on sensible 16-inch wheels with 205 55 16 tyres. These are not run flats but I do not trust the tyre repair and inflation kit to work and know that you have...

Is one missing wheel nut now an MoT fail?

Is one missing wheel nut now an MoT fail? On a similar subject, can you still have an MoT a month before and still use the car even if it fails (unless it's considered unroadworthy) or has that changed...

Will fitting larger wheels give a better ride?

I have a 2002 Toyota RAV4 with 16-inch wheels. I would like to replace them with 18-inch wheels because I believe they would give me a better ride. Any reason why not to?