We have a higear one from Go and it works great. Has 12v and house plug with it, as well as all the different adapters for different size air bed holes. Very good for reverse pumping aswell, we can actually get our 2 single airbeds back in to ONE of the boxes they came in
The Tesco seems well rated, and is an excellent price. On site it would have to be plugged in, either to the car's 12v or EHU for mains. This is where the rechargeables score. They can be charged before leaving home and should last the trip easily.
We paid rather more for our Outwell Tornado 12v/230v Rechargeable pump for use with our old school double rubberised cotton lilo type airbed. It would inflate it rock hard in about 2 minutes, and a charge lasted 2 or 3 goes. The same style pump appears under different brand names so may well be made in the same factory then badged as required.
The pic doesn't show it but there is a 12v plug to power it or re-charge it from the car.
Our new Aerobed has its own screw on re-chargeable pump, which I have to say is excellent.
------------- Mike
My advice is worth no more than the price paid for it