We shortened the first day a bit as we had travelled up that morning to the start. We stayed at one of the pubs in Torver, but I think both of them do b&b. There are b&bs in Chapel Stile in Langdale, but they were all full when we came through, so we walked over to Little Langdale and stayed at the Three Shires. In Borrowdale we stayed at a b&b in Stonethwaite, can't remember it's name, but there is a pub there which is right on the path and does b&b. I think I found them all on line.
When I rang to book the Three Shires they only accepted 2 night bookings at the weekend, so I went through Booking.com which let me book a single night.
Hope that's helpful. It's a wonderful walk.