Just thought I'd post my experience of fitting a wheel spacer from Elise Shop.
I have always quite like being a bit closer to the wheel, so decided that the 30mm spacer would be ideal.
The usual efficient service from Elise Parts saw a nicely made aluminium spacer arrive in 2 days. I was a bit dismayed to have to drill out some holes to fit the M6x50mm cap-bolts required, which I was disappointed to find couldn't be included for the price.
The wheel came of easily enough but I did raise a smile at the use of a valve spring to maintain the tension on the retaining nut!
Spacer duly fitted and a test drive was a revelation; not only was the wheel now perfectly placed for me (a bit kart-like) but I can now brake with a straight leg rather than the splayed-leg style to avoid my knee contacting the bottom of the wheel.
Steering feel is much improved and the general 'pointyness' of the car seems much better.
Not a hard job, but very rewarding with the results far outweighing the investment.
If you've ever thought about it - just get on with it.