What are the new speed limits for trucks on single and dual carriageways?

A:

From April 6 2015 the national speed limits for vehicles over 7,500kg gross vehicle weight on single and dual carriageways in England and Wales only increased.

Single carriageway: current limit 40mph, new limit 50mph.

Dual carriageway: current limit 50mph, new limit 60mph (unless specific lower local speed limits are set).

These speed limits applied to your 3.5-tonne gvw van previously so there is no change there from a speed limit legislation point of view.