This is so frustrating. What I really want is something I've found called a Bogen 3424 into which you can slot the centre post of the tripod to give you plenty of movement, etc. However, I can't find a British stockist or an equivalent design. The item I'm referring to can be seen at the following link and if you click on the picture, you'll see what I'm trying to explain!
Bogen Manfrotto Column Clamp 3424 w/ Free UPS
Is there a UK equivalent?