Hi, I am in need of a new chain tool due to continully breaking the cheaper ones. Has anyone got any recommendations into which on to buy/not to buy? I ideally want one with either a lifetime warranty or replaceable pins and it has to be able to fit different speed chains. I was looking at the park tool ones but I am unsure.

Opinions?

Is this the one you are talking about? http://www.chainreactioncycles.com/Models.aspx?ModelID=5

I have tried similar styles to this but due to having short handles I use a spanner for more leaverage. This usually results in a bent handle. Would this be likely to happen with this model?

I got one from a crappy shop about 3 quid still doing me well?

As said before if you're needing a spanner you're doing it wrong.  I use a collapsable Park Tool one (CT-9 IIRC) and a Hand Tools one (comes with replaceable pins) and have had no issues.  However the halfords bike hut cheapo ones are made of cheese, if that is what you were using.