So I went to Halfords, handed over £50, waited an HOUR and had a youth come out to my car to fit a nice shiny set of euro number plates to replace my bimmer's almost delaminated (i.e. unreadable) ones.
Except he couldn't remove the old one from the rear

Some sort of BMW anti-tamper rivets. Plasticoated metal, with no apparent method of removing. The guy gave me a refund and told me I'd have to go to the BMW dealer to get the plate changed. I asked him to destroy the plates, which he did.
Curiosity just got the better of me and I've just been out with a small flat-blade screwdriver. 15 seconds later, I had the plastic caps off, revealing the philips screws beneath.

They're decent enough guys in there (1) so I'll give the branch a call tomorrow and ask the store manager (who took my money, but didn't make or try to fit the plates) to get new plates ready and get a non-muppet to fit 'em, with a suitable discount for dicking me around.
Seriously, does no other car maker put simple plastic caps over number plate screws? It it really rocket science? After the yoof spent so long making the plates (which looked great btw, with extremely subtle Halfords branding), how the hell could he be beaten by a silly little plast ic cap?!? URGHHHHH!!!!!
(1) Newcastle-under-Lyme, Trent Vale. I hate going to the Hanley one and loathe the Fenton branch
<steve_earwig> I think this forum is more about keeping our cars going with minimal outlay than giving our cars more reason to go bang