I thought British law limited them to 60?
your are correct, MPH is still UK law, this is taken from the UK Gov website,
Speed limits
Built-up areas *
Single carriage-ways
Dual carriage-ways
Motorways
Type of vehicle
mph (km/h)
mph (km/h)
mph (km/h)
mph (km/h)
Cars & motorcycles
(including car-derived vans up to 2 tonnes maximum laden weight)
30 (48)
60 (96)
70 (112)
70 (112)
Cars towing caravans or trailers
(including car-derived vans and motorcycles)
30 (48)
50 (80)
60 (96)
60 (96)
Buses, coaches and minibuses
(not exceeding 12 metres in overall length)
30 (48)
50 (80)
60 (96)
70 (112)
Goods vehicles
(not exceeding 7.5 tonnes maximum laden weight)
30 (48)
50 (80)
60 (96)
70 (112) **
Goods vehicles
(exceeding 7.5 tonnes maximum laden weight)
30 (48)
40 (64)
50 (80)
60 (96)
* The 30 mph limit usually applies to all traffic on all roads with street lighting unless signs show otherwise.
** 60 mph (96 km/h) if articulated or towing a trailer.