Right a little update to this today. Tools finally turned up on Friday but was away this weekend so only got chance to look at it this afternoon.
Took camcovers off, found that No1 sparkplug seemed loose, infact they all seemed loose, however I persevered anyway as I wanted to check the timing. Found TDC, managed to fit the cam lock to inlet cam fine, exhaust one wasn't happening, so I loosened the cam pulleys and managed to get the cam lock fitted. Also noticed tipp-ex marks on the cam pulleys which almost lined up, which gives me the impression that it wasn't timed up properly in the first place.
Anyway, tried to move the tensioner to tension it all up, but the pointer didn't want to move, I think it's knackered so will have to order a new one. Might as well swap the cam belt as well while I'm at it. So I'm 1/4 of the way through it. Problem is now I've got to tackle the crank pulley nut, so I'm either going to:
a) Buy the Clarke corded impact wrench (Apparently will do 450nm)
b) Carefully drill the nut and split it (Probably the cheapest way)
Anyone used the corded Clarke one?