It looks like it's Strike's, based on the sign on the ground floor by the lift.
It's on level 2 (as was Dunelm - level=1 was an error).

I've tagged it as leisure=bowling_alley, just based on that being the first thing listed on the sign.  The full list from the sign is in the description tag.
I haven't actually been up and looked.

If anyone can think of a better leisure=* tag feel free to apply it.