Couple of ideas.
First is a tour around Wales. The rough idea is to head for the Welshpool area from home (Midlands) then follow the border down to Chepstow. From there head West and follow the coast all the way to the Dee. Back to Welshpool via the borders, then home. I've just started the detail route plan.
Second is to go to the Alps. Rough plan is to cycle to the South Coast, ferry to Le Havre, Geneva, nip around the Alps a bit then home.