Ah ... found it.
Yes, collisions. Pr'aps I need to upgrade to the Medium lane 
This was confirmed on Saturday morning

I happened to brush past a wumman and apologised, to which she said ok. I thought all was well but, oh noes ...

As I was pausing after half an hour; she turned up and let fly ...
"You are annoying me and you kick'ed me, so I'm getting out! You shoulds not be here, you shoulds be over there!" 
I apologised again and noticed that her husband was a guy I'd actually had a brief chat with a few weeks ago - a pleasant chap.
In the changing room I noticed him and said, look I'm really sorry, you know it wasn't intentional. The expression of

and the smile said it all

I am upgraded
