Yes, I have had this for a while now. I first contacted Thames Water about this at the beginning of March. They say it is perfectly harmless (if not very off-putting) and that it is caused by millions of micro bubbles in the water supply.

They said that they are aware of the problem in the area and they are working on it. I called several times, the last in April. They were going to flush the pipes after my last call, but it seems worse than ever at the moment.