hi Kevin
wow, thanks for the super detailed response. It's not actually my tube (my own Caddis 2 is safe & well) but a mate's which is dry docked in my shed. The bladder is with someone for repair, but they've not reported much success, hence the hunt (for Red Oktober, ha!)
I'll get the bladder back soon, and see if I can patch it - but as it's the U-shape, if it goes, it's quite a sink risk, so I thought I'd hunt around. It's kinda sentimental to get the tube floating again, so don't want to bin it just yet, but been really hard to source a replacement from the UK.
Sub 50£ - worth a punt. More than that, probably worth seeking a new one entirely!
Spoke to Snowbee today - they had a look, but nothing in their warehouses.
The link via BFTA was useful - pointed me at some Tear-aid stuff... that sounds promising.
Let's face it, if some dude can build his own, I'm sure I can arrange a repair of a slow leak.... famous. last. words....
cheers
iain