Thanks for the pointer, it works for me now too.

I did it one package at a time with re-boots in between in the hope of isolating the package that made the difference. If it's any help it was kernel-power-flasher that seemed to make the difference. Though I'd been through all the bme packages first, then kernel-power-modules, kernel-power and kernel-power-bootimg before I got to kernel-power-flasher.