I have recently purchased a Start 52. I have installed the newest maps, but the speed limits for my home area are not up-to-date. I live in the London Borough of Lewisham. In September 2016 there was a borough wide 20mph speed limit introduced on all roads other than the Red Routes managed by Transport for London, and the main trunk roads. My Start 52 still has 30mph as the limit on these roads.
This means the speed warnings are wrong, and I wonder whether it would also effect the journey time calculations. Thoughts please.