The policewoman's name is Jill Cowling and the reason behind the girls meeting up with her is a bit more mundane than suggested in one of the above posts.
Jill is a designated liaison officer for escorts in the North East. She's been working with a local project that helps WG's in the area and has been giving safety advice and support to girls that want it.
It's by no means a case of trying to scare or worry clients. But it is a way of letting any local escorts (not just Amour) know that they will be taken seriously if they need to report a crime that happens to them whilst working. It also gives the girls a "face" in uniform so some escorts may feel more comfortable around the police in general and feel more at ease to approach them if needed.
Jill's been mentioned a few times recently hoping more girls will be happy to meet her and realise that the police can help with their safety especially if working alone.
Oh, and she did also advise about 2 girls working from one property, current laws regarding sex work and agencies, safety and criminal issues, and how currently Northumbria Police deal with the above issues. All informative stuff, plus she's really canny too.