Plus StreetMap puts North at North, using Bing OS maps give a slight feeling of dizzyness. But at least with Bing if I zoom out from the 1:50,000 map so that I can see more of the 1:50,000 map it does actually show me more of the 1:50,000 map instead of deciding, oh, no, you really want to see the 1:200,000 map and chuck away all the details I'm trying to use.