do your best to make sure he knows and fits the exact part no, rather than any odd spare he has in the van. Most importantly, don't accept a part by another maker.
Thanks all for your help. Problem was indeed a faulty MCB. Managed to get a local electrician to pop in and change it over late afternoon and we're all back to normal. MCB was replaced with a Hager unit (all be-it different looking to the existing ones).
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