Having a problem with getting it click into it's upright position, this has only just happened and it's been fine for the last 5 years. Since this happened the direction of suction is only through the wand (I would call it the handle but that's what it's called in the manual). I can't see anything broken or any obvious damage. Does anyone have any idea what's happened and what I need to do to fix it?

Go look at the dyson site they give you excellent step by step guides on what to check when things go wrong.

Dyson UK - Dyson homepage

Failing that give them a call I know they charge for a call out if you decide to do so but they do fix the appliance for that price and its cheeper than a new one.
Always happensd when the 5 year garrentee is up doesn't it I love ours and we have had two in 9 years I certainly would never change brands again.