Reasonable UK VAT filing fee

My business is not based in the UK. My current accountant is renewing the contract and wants to charge me 700 pounds for just one annual VAT filing. Does this make sense?

I feel like this is way too much as it’s just one time filing and prob only takes less than 1 hour to do the paperwork. Amazon collects most of the VAT for me, and all I need to do is filing it to HMRC…