Yup, I got a 10 year Toyota plan in June from
Abbey Toyota in Redhill. They are a official Toyota service centre. I believe they see alot of GRY's as there is a thread on here that recommends them.
Its local to me so I plan to get my GR86 serviced there, but the service plan can be used at any recognised Toyota dealer/service centre.
My supplying dealer couldn't do more than three years either.
The 10 year plan is £36.36 per month, so about the same as the three year plan. As I plan to keep the car, seemed sensible to do, and I believe it is transferable if I do sell.