"Allowing holders of driver licence class B to drive electric vans class C1 (light lorries) up to 4250 kg (2019)"
Is this a good idea? Is this save? There are C class driver licenses for a good reason, those heavy cars just behave differently on the road, there are different regulations for them. Sounds strange.
If you want electric delivery vans, yes.
Delivery companies that own their own vans and pay their employees hourly are in price competition with 'gig economy' delivery companies where the driver brings their own vehicle and gets paid per-parcel - so traditional companies are limited in their ability to absorb or pass on higher costs.
A diesel class B van with a 3.5 tonne weight limit, set up as a delivery van, can carry perhaps 1 tonne of cargo. In inner-city areas, where the density of deliveries is high, vans having a shorter range isn't a problem - but the vans will leave the depot at the absolute maximum weight capacity.
If electric vans have 20% less cargo capacity due to the weight of the batteries? That's a profitable business turned into an unprofitable one.
While there are some delivery companies (UPS for example) that use a lot of class C1 vans, and hire employees with the special licenses required, the supply of people with C1 licenses is much lower than the supply of people with B (i.e. car driver) licenses and the hourly wages are higher accordingly.