So finally got around to switching the surge capacitors and hey presto – the oven is back fully working again and has been for the past week! Thanks for the pointers – a very satisfying exercise.
Would just like now to clean inside the glass door, is this type of glass possible to be removed? It is different to my previous doors in that it looks like it is sealed, with no void. There are two screws but I’m not sure if they are for the hinges.

Any thoughts?