OK... so I went to LIDL on the way to work on Thurs morning, bought a second sander (because my first one can't last for ever) and a few of the saw horse type things... only 7.99 inc VAT which is a bargain, they are a bit lightweight but they do perfectly for me, for spraying and as a temporary table.
I had a big problem with the sander I bought though!!! the base was slightly loose and wobbly. Luckily I dropped it back on the way home and they exchanged it for a new one, just letting people know... beware!!! If you have bought one and the base is slightly loose you have to bring it back, it is not supposed to be like that, it will only get worse and the vibrations will kill you during use... so be warned! The base should be absolutely solid with no movement. But I do stand by what I said about my first one, I have used it heavily and aggressively on a daily basis and it's fine.
I may have got the only one that's a bit dodgy... alternatively the good ones may be the exception. I think the problem with cheaper tools is that the quality control may not be there...