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Thanks for your questions, I am Sam and I am one of the UK tax experts here on Just Answer.
Your assumption regarding the VAT position is correct, unless they are registered for VAT (as they exceed the VAT threshold) then no VAT will be charged, and as their invoices do not contain a VAT number, you can safely assume they are not in this income threshold, so no VAT will be charged.
And yes these are more than sufficient for evidence of the costs paid for the work to be undertaken, but if you paid by credit card or cheque, then keep evidence of the relevant statements to, which can then be deducted from the gain when the property is sold, and capital gains have to be considered.
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