is there a such thing as a fast lane
Passing lane A passing lane is commonly referred to as a "fast lane" because it is often used for extended periods of time for through traffic or fast traffic. In theory, a passing lane should be used only for passing, thus allowing, even on a road with only two lanes in each direction, motorists to travel at their own pace.
Road speed limits in the United Kingdom The speed limit is 70 mph (112km/h) on motorways, 70 mph (112km/h) on dual carriageways, 60 mph (96km/h) on single carriageways and 30 mph (48km/h) in areas with street lighting (restricted roads). These limits may be reduced by roadside signs and apply to cars, motorcycles, car-derived vans up to 2 tonnes maximum laden weight (MLW), and to motorhomes or motor caravans not more than 3.05 tonnes maximum unladen weight. Other classes of vehicles are subject to lower limits on some roads.[1]