Ah. My understanding was that it's the version of maps that's tied to the car rather than the specific copy of the specific version. So a car is set up to work with v3/4/5 and will work with any copy of that version.
I'm sure I've read that from someone who worked at a garage, though I'd be hard pressed to link to where I saw it having read god knows how many different things from different places. So i'm not after getting the latest version, just the version I had before I did a stupid. I should say, if I get a copy of v3 (034) it'll be going on the original SD card. It's not been formatted so any special partitioned stuff that's on it is still there. It's just the map data I don't have.
Worth a shot, I thought. Otherwise, yeah - pay the man.