Thanks all. According to this very site, Sherpa do not currently offer baggage transfer on the ODP. On the website you mention, which I have been studying for the past few days in conjunction with the official trail website, there are several baggage forwarders, but seemingly just one that does the whole route and not as part of a full holiday package.

It looks as though the only sensible way to break up the walk is into the 12 sections as per the official trail guide. This means that the first three days are all 17 or 18 miles - a bit more than what I would want to kick off with - but hey, I've just done the Pennine Way, so nowt to worry about!

Over the next few weeks I will gently check with the missus that she meant it when she said she would be happy for us to do another LDP!