Squadgy,
don't know if the term is "CAA approved" or not, however there are electronic logbooks that are accepted by the CAA and are JAA compliant. These I belive can be used in lieu of a paper based logbook - they have sophisticated tracking and amendment recording features, and can print out the necessary stuff for sending to the appropriate authority.
A look at any of the pilot gear websites will give details of a couple of the better known ones.
DW