Thanks for the comments!
Something I've noticed after these last couple of nights away is that the new foam in the engine deck cushion is too firm! I got a set from GB Foam Direct, for VW T2 campervans, and for the seats its fine, but that cushion I need something a little softer. I've ordered some more foam to replace the existing one so will see how that is.
Also I've noticed a strange noise when the engine is idling at traffic lights etc. It goes away when I press the clutch in, so I thought it could be the clutch release bearing. It's not too bad right now but I have a feeling it won't get any better!