Hi All,
Wally also contacted me about this via email – his exact words were:
“…I just went to Battersea Power Station today (Sunday) and found there is a problem with trains. None move to Clapham junction during the weekend.I came home a different way to getting there.Of which I will not tell you about. I walked over Chelsea bridge because I wanted a classic look of the power station.I then caught a 24 along the embankment to Victoria and caught the underground (District line ) to Blackfriars and came home on the thameslink. You may be able to go via London Bridge to Battersea power Station but I don’t know which line gets you there.Good luck with that…”
Wally.
So, I’m wondering whether it might be a good idea to postpone this outing until the trains are back to normal – if indeed that is ever likely to happen! 
Dave