The above link has been a little edited somewhere along the line, I think. The link direct to the Mode S page seems to be:
http://www.caa.co.uk/default.aspx?ca...90&pageid=6476
There is an online questionaire for those so inclined to respond, but it helps if you read an inwardly digest the RIA document before attempting it.
The RIA document itself seems a little flawed and makes a number of errroneous assumptions. It's well worth a read if you are interested in the future costs of recreational aviation, even if it is a bit hard going.
VP