In reply to nathan79:
This is what I went for late last year as an upgrade from my much loved Jessops £25 job (see above) which just isn't man enough to take a big lens.
https://www.amazon.co.uk/gp/product/B01N0L544G/ref=oh_aui_detailpage_o07_s0...
It can easily hold a DSLR & 600mm Lens, folds down very well (small as the Jessops), is flexible in terms of set-up on uneven ground (e.g. steps), able to hang the camera underneath for macro work. One leg detaches and can be used as a monopod. I was sceptical about a ball head at first, thinking I might get a pan and tilt video head, but I'm getting on with it really well.
The only thing is it gets a little bit spindly on the final extension of the legs, but It's easily high enough with out using them.
Spare Mounts for different lenses/cameras:
https://www.amazon.co.uk/gp/product/B071K5RPFF/ref=oh_aui_detailpage_o07_s0...
Post edited at 21:01