If you want more space, just buy a commercial logbook. There's no rule that says you have to have a PPL logbook for PPL flying, you can use anything that suits you.
The Pooleys commercial (non-JAR) one is quite good, as is the CAA logbook. I've been using the former for a couple of decades, and more of that time was as a PPL than a commercially qualified pilot.
Transair or Pooleys sell a selection - just go into a shop and pick one.
As for copying up - a few tens of hours are neither here nor there, and just hang onto the original logbook in case you're ever challenged. CAA are however very unlikely to challenge you so long as the course summary statement by your school are original, which they will be.
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Last edited by Pilotage; 20th Dec 2012 at 08:51.