Electronically supplied services by Canadian company to UK based business

We're a SaaS company in Canada (Company A) with a UK customer (Company B) and will only have business customers in the future. From what I have read once we have crossed the threshold of one transaction, we need to register for UK VAT. Company A is selling an electronically supplied service from Canada into the UK and this falls under the 'reverse charge' rules. Company B's VAT registration number is collected and included on the invoice supplied by Company A. Company A will invoice the sales price and mark the invoice 'Net of VAT' and have a comment that 'Reverse charge applies'. From what I have read, being registered for VAT we would have to file quarterly, and since we're not collecting/remitting VAT, would we file nil returns? What would be the next steps? And any guides/references would be greatly appreciated.

Hi,
If you are a company based in Canada and you only make supplies which are subject to the reverse charge then there will be no requirement or entitement to register for VAT in the UK as the VAT is being acccounted for by the UK business customer.
Please see below:
Reverse charge
Thank you.