I think it's a bit like sticking 'allegedly' in to something - in the US I think the 'I believe' would get you off (depending, however, on how serious the thing is you are 'believing'). Then again in the US you seem to be able to say pretty much any damn thing at the moment so there's that.

Unrelated, I am back in Wales - might you be up for a visitor or adventure of some sort this autumn sometime?