My TomTom Sat Nav usefully prompts you with the speed limit for the road you are driving on, and although they have a disclaimer saying that the accuracy for being up-to-date cannot be guaranteed, I have noticed that all UK motorway and dual-carriageway slip roads and any interconnecting roads, whether they are single or dual-carriageways, are indicated to be 60mph.
I would have thought that the speed limit for slip roads and interconnecting dual-carriageways (e.g. road connecting M3 to M27) would be the same as the speed limit for the motorway, which in the case of cars, motorcycles, car-derived vans and dual-purpose vehicles, is 70mph (when not towing a trailer, other vehicle or caravan).
I have always believed that The Highway Code is the go to for the laws regarding driving within the UK, yet the page on Speed Limits does not answer the question.
What is the situation within the UK?