Thanks for the replies.
Er, I’m a complete noob regarding this. It’s for a motorbike. I don’t have a garage. It’s a fully enclosed driveway/rear garden with 4ft walls and 3 ft fencing on top, all round. 2 gates, one single, and doubles at the driveway end. Currently a single padlock on each. Plan to add extra padlock and hasp to each, disc lock for bike, cover, and then anchor and chain.
My MTBs live in the house and have done for years.
The garden walls are a long brick length deep. Most wall bolts seem to be around the 80mm mark, so they should go into the brick okay without going through the other side. I understood resin fixings couldn’t be used in brick, only concrete? It’s a minefield.
I don’t really understand the bucket of concrete solution.