Longman had a look, loosened my chain, it was too tight. Seems to be better, it isn't smooth out of first, but hasn't been stuck since. He suggested an oil change now.
I dropped the oil that the 'dealer' put in, it was like water, very think stuff. I've put some Halfords semi-synthetic bike oil in now.
Unfortunately I picked up a nail, so have a flat, so I'll not know until this afternoon. Taking the tyre to get repaired.