Tricky, as I don't know how far I will be going each day, so I can't book. I'm hoping to find accommodation when I stop each day: youth hostels, B&Bs where possible but failing that I have acquired a lightweight tent (Vango Apex 200) - a cosy 2-man tent. I'll be taking a sleeping mat and a worryingly thin lightweight sleeping bag - the total weight of these three is about 2.5kg - but I hope not to use them. Also had to buy a Ortlieb RackPack to carry the tent and sleeping mat, which probably weighs another kilo.
Instead I have a list of youth hostels, and I'll hope to use my phone to find other places to stay: TripAdvisor, various B&B directories and campsite directories. We will see how this works out in practice.