Ah!
It might very well NOT be a 12 V LED although I thought it was. So it is probably toast by now, having been exposed to 12 volts backwards.
Ordering a 12 volt one NOW.
However, it turns out a mate of mine has one of the £2000 Volvo code readers and he is getting the screen repaired next week - so he may be able to read the codes for me.
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