Regus have good locations that is the only positive (however, now there are many other services office providers/virtual office etc all in equally good locations). I have had both virtual and physical offices (did physical and then thought cutting costs and thought surely they could not mess up on virtual but boy was I wrong!) and both were a disaster that would never use again!
1. Automatic Renewing contracts with 3 month minimum notice if want to leave before contract expires - this is by far the worst. Today there is no reason to have to lock people in these contracts but for Regus it is a cash cow. So for instance if you had a 12 or 6 etc month contract and forget to give the 'at least 3 months notice' then they just lock you into another one and there is no way of getting out - UK government consumer rights legal departments should look into this! Most other service office/virtual office providers need your permission or just go into rolling monthly contracts. In fact, if you are looking for a virtual office there are many with far better terms that are no contract and monthly renewing only or short contract that just roll monthly after the contract.
2. Customer service - shocking! Before signing up they treat you like a king as the sales rep (on a commission) will be beaming with a smile, contacting you with any question you have and chasing you up to see you sign up. Once you have signed up it is a slow process to get questions answered by either Regus Canary Wharf or Regus head office via email. You will chase and chase wasting so much time.
3. Billing! This is a real nightmare. For physical office they will frequently do billing errors with added IT costs or duplicate billing to the monthly invoice. So then if you pay the correct amount and ask for a new invoice will take months to come back and then bill does not get updated so they add late fees (due to you not paying the billing error extra items and since not updated - they seem to outsource some of their accounts to maybe Philippines or some other place ). Turns into a real mess quickly as next future invoices are impacted in the errors that just compound.
4. Costs. If you look around you can also find a far better deal by another provider - sometimes in the same building or another very good building close buy for up to 50% o more cheaper.
Summary - Regus dangle a golden carrot that can sometimes look good, but is not. Search else where and compare other places, far better options and NEVER would recommend.