Update : Or can I?
The difinitive choice looks to be the 141RC. But at an online price of about £60, it's just too steep. They do go on Fleabay for a lot less, but only occasionally.
Looking a little "lower" there's the 460MG. It's magnesium cast, so light (less than half the weight of the 141RC)... But that also means it's rated at half the load. That should be OK though ~ I know this tripod isn't going to be suitable for long zooms. Otherwise it's actually more versatile than the 141RC, although more fiddly to control (141RC has BIG handles). The sweet bit is, though, that it costs more like £45....
Still, though, i'm currently looking at spending about £140 on a damn tripod. (if I go 190 Pro & 460MG). That's a lot...