kids offroad lesson wanted in West Midlands area

Hi all, my 8yr old grandson's been badgering me for a while that he wants to ride a bike like his grandad does (he doesn't know i ride badly bless him) and as my 525 & CRM are both a bit big for him, I'm looking for anywhere in the West Midlands area that could teach him to ride, he'll need to hire bike and kit.
Anyone know anywhere, preferably thats open half term week at the end of October which is when we're next going up to see them?
I'm based down South so I haven't a clue what's happening in that area, any ideas ??
Cheers,
Andy