Re The Tubes
Sorry its been a while, away working, someone has to! Anyway, re Henshaws. I phrased it wrong. It wasn't that they couldn't do what I wanted, more that it was not possible.
They gave a good quote though. I'm still looking at other options, one of them being upgrading to a larger boat. The useage is more recreational than anything else so maybe getting away from the Humber range, although damn fine boats, can be a bit utilitarian. I've looked at a Revenger but that was more sports boat than rib IMHO. Doesn't seem enough tube diametre in the bow sections. Also looked at Zodiac, but again they seem rather too pricey for me new.
Still looking, altho my budget will be somewhat limited as the funds will come from the sale of the Sealine. I'll wait to see what comes up on the secondhand market.