Sorry Nigel
The ones listed above do the job, they just don't have a 'large' flat plate like the Lift buddy, it's a 'wedge' shape with a lip instead of the flat bit, that's all, just needs a little extra care and at £15, well.
You used to be able to get stuff from the states and rarely pay import tax etc, now virtually nothing gets through, so even $30 by the time it's shipped and tax paid?
I guess it also depends how often you're gunna use it.
Al.