Thank you Jason!
Well I've been torn all morning because I got into contact with projump/ghostbikes about getting the clamps as well and they had a look at my powerisers and made me a really good offer. But obviously even the best offer is going to be considerably more than a couple of pounds from the pound shop lol
Eventually I decided to go for the cuffs because:
a) I usually bock for 10-15 minutes at a time, take them off to give my legs a wee rest (I really am unfit so mu muscles get tired quite quickly) and while I'm resting one of my friends usually has a shot. I didn't fancy spending huge amounts of time undoing/retying the straps (Pinhead's quick release ones would have been ideal but as you said he isn't making them any more)
b) Because of the padding round the knee bars I find that they're really too wide for my legs which makes it quite difficult to even walk, the cuffs look thinner and will hopefully be more suited to those of us with little legs (lol)
c) My boyfriend is paying
haha
So I've placed the order and my stuff should be here by tomorrow or Wed at the latest! Hurrah!