I spent the last long weekend in Suffolk, based in a b&b near Sudbury. Suffolk is great cycling country, pretty flat, you can find lots of quiet roads, lots of pretty villages (Lavenham is a must for a cake stop) and the Dedham vale area of outstanding natural beauty.
You could catch the train to Sudbury (assuming no rail replacements) and head north out of there towards Acton and Lavenham and then do some sort of loop to the East (e.g. https://www.strava.com/activities/964959505), and then on day 2 could do loop northwards towards Bury St Edmunds with stop at Maglia Rossa cycle cafe. Can easily cycle to Cambridge too, very nice route we took on the way back, hardly any cars on the roads: https://www.strava.com/activities/966381571