Tom, All i know is they were there. While researching my Grandfathers war history I found it in the regimental diary. Notes not to hand at the moment so can't give exact dates. All that was mentioned was they had been assigned to 7th Armoured, around 8 weeks later was the next mention of 153 bty in the diary. Grandad had quite clear memories of that time. As a battery does no have to keep a diary I have hit a brick wall with my research on that, as you say there is no mention anywhere else (or not that we have found).