I did ask whether they were based in the UK but they didn't really answer those questions.
Ok - so when you asked them outright, they prevaricated rather than lie? That's better.
Generally speaking, false claims are a warning sign. Consumer Protection and Sales of Goods and Services laws clearly state that companies should not
1) misrepresent their geographic origin and/or the origin of their services (for example, if they are Pakistani, they have to say so and, if they are British but are assigning you to an ESL writer, they have to clarify this)
2) employ false advertising claims
3) enter into contractual agreements which violate the terms governing `fair contract'
4) fail to dosclose their company registration number and registered office address (if they are British)
These same laws further emphasise that customers (potential or existing) must have all information relevant to the purchase decision. In other words, companies have to exercise transparency - you, the consumer, should know the nationality of the company you are dealing with as this directly relates to your consumer rights. Think of it this way: you ordered a paper from Company X; you received it after the deadline and the quality rendered the product unusable. If you are dealing with a British/American company, your rights as a consumer are well-protected. But, what if you are dealing with a company whose nationality you do not even know? This is why the disclosure of nationality is important.
Another thing - there are many rotten companies out there but many of them have a handful of truly excellent writers. So, even though the chances of your landing a good writer are minimal, it is possible. Where the good companies are concerned, the opposite is true - the vast majority of writers are excellent and a handful are not (they are terminated soon enough).
The best thing for you to do is
1) either select a company with an established reputation
2) or place a small test order with dissertationdom and evaluate their work prior to giving them any of your larger orders.
Good luck and take care - do not enter into an agreement with any company prior to checking them out first and, please, use your own judgement :)