As I understand it, there has been an ongoing dialogue with the FDA about the suitability of the clinical data for submission in the States. I think they have decided that it is but it has yet to be submitted.
For a small company with limited resources,I think the easiest place to submit is on your home turf so I agree with their decision to go for approval in the UK first followed by the rest of the EU under the mutual recognition procedure. That way they can get some revenue which will help the funding of further trials if required in the States.