Decathlon Bolton have no problem with you pushing your bike around - never tried riding it.
Toolstation have no issue and at first invited me to bring it in.
Screwfix not keen and asked me to take it out, so i did, along with myself and my money. But my local screwfix is horribly stuffy and the staff are just odd so they may be the exception.
Halfords Bury are a little uneasy -especially when browsing the non bike stuff and near the glass cases, but offer to mind it at the checkout.
Millgate Shopping Centre send a team of 6 geriatric security guards to try and make you take it back the way you came, despite a nearer exit and the actual shop i visited not having an issue.
Lush didnt have an issue.
The Rock outdoor shopping mall took exception to me locking my bike to a lampost informing me it wouldn't be there when I came back, I wished them luck and sure enough it was still there when I returned. As i left one of the guards grabbed me.
When I ran a shop i was happy for bikes to come in, we'd always offer to keep an eye on them.
I have recently managed to get a local Co-Op, Sainsbury's Local, and Tesco to install hoops/stands by simply pointing it out on Twitter. I find these companies very responsive to twitter, especially if you can include a pic of you bike locked to the trolly rack etc and blocking a path or posing a risk of oiling old ladies.