If you live in Chester, I sadly have to confirm that the drains around here are hit-and-miss. During the summer, they can sometimes be OK, if a bit smelly. When the wind gets heavy, you might run into a problem with some blocked drains in Chester. I suggest hiring someone to come out and take a look at the problem.
I had to hire local drainage solutions, and they came out and fixed the problem for me. It was easy and simple and not too expensive. That was about a year ago, and I have not had any other major problems since. With my DIY ‘solutions,’ I was lucky to get 2-3 weeks of peace. So, if the drains are backing up on you, I would contact a local professional.