I want to get a service plan for my ‘17 plate (35k miles) E220d but I’m not sure which way to go about it. I could plump for the 1,2,3 or 4 year option but I’m guessing the 4 year plan guarantees no price rises whereas if I go for a 1 year plan it could be higher next year to renew?? My thinking is whether or not to try and time it to take advantage of any future 20% discount. I also don’t know if these are always at the same intervals and the same time of year. Anybody have any idea??