Thanks for the replies.
FFF
I’ve got around 85 hours, so some way to go before I get to 150. Flying while studying would obviously help, but I suspect if I did the hours-building intensively after finishing the ATPL’s, I’d be more current, and the flying would be higher quality and more relevant to the CPL (e.g. I’d be happier planning routes through class ‘D’ airspace and going off in murkey conditions if I was flying regularly, rather than just stretching my legs a couple of times a month).