I am surprised that anyone operates out of 'grotty' Swansea. It must be the grimmest airport in the UK and one which I only use when it is a customer destination.
Looking round Euroland, UK airports are the scruffiest but the staff are the most helpful and friendly.
Considering that the landing fees at UK airports are generally just slightly less expensive to those in Germany, I have to assume that the money collected goes into the owners pocket and to the CAA, leaving little reinvested into the airport. Or am I wrong?