Don’t overlook the Mazda Bongos. Not as big as the VW T4/T5’s, but certainly big enough for 2. Most have factory fit lifting roofs, which you can sleep in but are more useful as headroom, and a place to bung all your gear when you are inside the van. In theory they sleep 4, but it would be ‘cosy’
Some are 3-row 8 seater MPVs, some are 2+3+1 6 seaters with a factory fit ‘kitchen cube’ in the very back, and there are lots with UK campervan conversions.
Most are 2.5 Turbo Diesel, 4WD and auto, although 2wd, petrol (2l 4 pot and 2.5 v6) and manual versions are knocking around.
And they are a lot cheaper like-for-like than VW’s, or any of the other options – but smaller. Very car-like to drive too.