Hi Alan & Michele
I have just returned from hiring a van in Murcia at the weekend to do exactly that, ie drive to Ikea Murcia and back from Condado.
However I hired direct from Furgonetas Demetrio as if its Ikea Murcia you are going to you can no longer simply hire a van yourself but have to pay anything from 10% to 20% of the total cost of your order, which depending on how much you are spending can work out very expensive. Driving on a UK licence allows you to drive an 8 cubic meter Ford Transit and its quite easy really - imagine being 'White Van Man' for a day. Forgonetas are about a 10 minute drive from Ikea.
On a final note I have to say Ikea was a complete NIGHTMARE, 5 hours later I was ready to kill my wife or hang myself, obviously with preference to option 1, but then again, I would want to do the same in Ikea here in London!!!!!
Anyway, if you need any more info just let me know.
Good Luck
Gabe