VAT question

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I have a LTD with my DH, I have been using a supplier for a couple of months to provide a service let's say social media (it's not!).

Anyway the first 3 invoices have not had VAT added on to them and the latest (and last one) has. I don't have an issue paying it I am just wondering if I need some proof of their VAT registration in order to reclaim the costs as we are also VAT reg? If so what should I ask for? Also this supplier has been quite tricky to deal with, demanding PO numbers etc when we don't issue them and asking for payment before work has been done/started. We have so far paid 50% up front and 50% on completion but I can't help thinking they may not be VAT registered and just trying to get some extra ££ out of us.

There VAT number should be on their invoice, this is a requirement if they are VAT registered.
They may have only just become VAT registered so therefore only just started charging VAT.
If they don't have the VAT number on the invoice, you can contact HMRC for more info.

Thanks Bluebell, I have replied and asked for a VAT invoice so hopefully that will now be provided. I think perhaps they have just registered.