Can anyone recommend a place to buy ASV levers?
And does anyone know what is the difference between the various ranges (F1, F3 C/5)?
We got ours here Kev http://calsport.co.uk , but that was at the bike shows - good lads there, you might get them cheaper elsewhere!
Don’t performance parts do them too?
I bought mine from Calsport’s ebay store. Had a problem with one of the bushings but he promptly sent a free replacement which was the right part.
I bought the long ones from here, top quality product: http://www.ebay.co.uk/itm/181395428515
Thanks guys, it looks like Calsport are the recommended place. Cheers.
Shame they don’t come in green for you
To true, but black will be fine. 
I’ll have to look if they do them in Orange. 