Crazily narrow road in the finale of a sprint stage.
This is a very typical problem of British races across the board - towns and cities want to get the finish near the centre for the promotional shots, and often there's overly technical finishes or some unnecessary twists and turns too close to the finish, or more street furniture than the average Dutch race. These East of England stages are never tough enough to break up the field (and probably wouldn't be even if they
did utilise the fullness of the area) but the towns are mostly relatively small and are often too congested for a safe sprint unless there's a seafront promenade to use. Remember the Bury St Edmunds stage of the women's Tour a couple of years ago, that had two chicanes, progressively tightening, on a single lane road in the final kilometre, before a slight downhill on brick paving?
This was the same finish as was used in the Women's Tour a few years ago (believe Jolien d'Hoore won that day) - and more or less the same weather too. They got by ok that day, maybe more by luck than judgement given some of the risk involved, but that probably meant they were happy to use the same finish today.