http://www.halfords.com/workshop-too...er-rocket-lift
This is one of my two jacks. It is sturdy and has high lift so can be used on the central lifting points as well as the pads.
SGS Engineering sell some nice jacks at reasonable prices.
https://www.sgs-engineering.com/gara...n-trolley-jack
The standard 75 jack is more than adequate for wheel changes by lifting under the sill pads.