Before you do any of that check whether it would make sense to do electrics at the same time rather than three years later... ask me how I know.
I suspect the answer is a slightly more costly version of how I learnt not to grease a seat post for a carbon frame...
Apart from the obvious checks like new fusebox, new fittings - how do you know if the electrics need to be updated?
how do you know if the electrics need to be updated?
Given the amount of work you think you need to do, they need to be updated.
Any reputable Sparx will be happy to do a survey of what you have and how it can be improved. A surveyor should spot anything dangerous.
@lookitsluke started
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Before you do any of that check whether it would make sense to do electrics at the same time rather than three years later... ask me how I know.