Looking at RTT there are several multiple class 175 workings today, 4 and 5 car (ie 2+2 and 2+3).
They must have been freed up by new 197 and Mk4 workings, which is beneficial all round (until they are withdrawn!).
Yesterday and today, my daily commute has been on a 150. Normally it is a 175 or a 158. While there may be freed up 175s, there aren't enough extra to go around
Yesterday morning I was greeted by 150240 on the 0731 Holyhead to Birmingham International
On the way home 1D14 was 150240
again. Normally a 158.
Yesterday 150257 was on 1V94 Holyhead to Cardiff Central. That is usually a 2 or 3 car 175 from Holyhead.
This morning it was 150267 on 1V94.
I'm not exactly sure what is going on. There were some cancellations yesterday.