To rephrase the question slightly differently: "Is Atlas a suitable tool for a UK startup, selling to the UK/EU markets?" To which the answer may well be "No.

To rephrase the question slightly differently: "Is Atlas a suitable tool for a UK startup, selling to the UK/EU markets?" To which the answer may well be "No. Right now, Atlas is US-centric, but could potentially broaden its scope in the future to include other jurisdictions". Personally, I'm not worried about Atlas, in the same way as I'm not worried about other US company startup facilities. When I started my latest UK company, I used a UK accountancy service, who handled the initial set-up for me.