New regulator arrived and fitted. All now working correctly

Haven't fitted a diode as recommended as I haven't got one and since the demise of Maplin not so easy to get just one.
Note to anyone else needing to change the regulator. Mine was fixed to the bulkhead using two nuts and bolts. It was a challenge reaching the nuts way under the panel so on refitting I used two M5 rivnuts, so much easier.