After a couple of years searching, eventually got a big double lockup garage, and I mean _BIG_ - just high enough to get a GS through either of the two doors, long enough to get a limo or two in and two lockable cages at the back!
Built into the base of a block of flats so reasonably* secure, sadly no leccie, but that's not really an issue.
Now, to fill it... :-)
(* as secure as it gets in Sheffield)