[mothered]

It states:

We may ask you for more information to support your claim, such as:
y original receipts, invoices or valuations dated before the item was insured, and
y instruction booklets, photographs or details of where and when an item was purchased.
Do not get rid of a damaged item (unless it could cause harm) as it could help us settle your claim faster. If you do not
provide everything we need, it could mean we do not pay your claim or we reduce the amount you can claim for.

So I have no doubt that it would be covered. My excess is at £350 for such a claim, too. I'm re-thinking and don't think the claim would be a good route to take. It does state multiple times in the policy about loss adjustors and independant investigators, also.

Agreed.

There are too many variables that may lead to significant complications.

I'm thinking at this point picking up a broken unit and replacing as faulty, might be the best option unless you can think of another method that has potencial?

Does the faulty unit have any Identifiable details (serials, model numbers etc) that can potentially expose that It's not the one being claimed for?