Has the front clam ever been off the car? As I discovered on my thread (front wiring loom quiz) the aircon relays are attached to the front passenger side wheel arch liner. It may be that they are disconnected or faulty?
I will check. No idea if front clam has ever been off. Only owned the car a week. Deffo worth a browse though. 
Mines been ice cold from new - just lucky it seems!
I need to get mine done, because, like yours, mine is useless. I had an 08 Exige S as a courtesy car earlier this year, and the aircon in it was like someone letting a CO2 canister off in the car - ice cold straight away. Bit of a pig if the hoses need replacing though. I will keep an eye on this thread with interest. Did you try regassing yourself it get it done by a pro?
Got it done by a pro at a garage with a fairly large expensive looking machine.
Will get mine seen to soon, needs new steering rack first i fear though.
Mine needs a new rack too, knocking quite badly. Kelveddon Lotus (spelling?) do a pattern part at less than the lotus original in case you wanted to know! Might also get the suspension refreshed too, after all its done 44k miles!
Worth a shout…cheers fella. I was considering getting the EP tuning rack. Ment to be a bit more robust so should last longer. Mines only done 11,000 miles and rack is badly gone already. Its been mostly parked up for the last 2 years before i got it.