So. Please see accompanying diagram. My flat is in one of two blocks on the same plot (basically the "same" block, just split into two buildings: the numbering goes from one block to the other.) In our tenancy agreement, we have use of one of the garages, which is where the car normally lives. Currently, however, the landlords have decided that they need to resurface the parking spaces outside the garages and at the front of my block, which means that there is no access to the garages and no parking outside my block.
We were informed by the agents that it would be possible to park outside the other block. So we have been doing so (green star). Today, however, we received a letter from a private parking company to the effect that we are parked illegally there, and they are going to charge us £100. They include pictures of our car in the letter, and have stated that they got our address from the DVLA.
Not a single car in the parking spaces either in front of the other block or my block has any kind of pass or similar indicating that it is "permitted" to park there, nor are there any signs saying that it's a restricted parking area. I reckon that somebody from the other block has reported our car because they can't get into their normal space, tbh.
AIBU to a) tell the private parking company to stuff it, b) complain vociferously to the management agents about this and c) hunt down whichever bastard in the other block shopped us and subsequently plot their messy yet ultimately satisfying demise?