What is a raspberry?

Reading the paper yesterday I encountered this passage:-

Desperately disappointed that the line-up of presenters for the BBC's relaunch of Top Gear does not include a disabled person. Most of the other boxes have been ticked - woman, black chap, foreigner, ginger, elderly man. But no room for a raspberry.

I would like to know what a raspberry is, in this context. I imagine it is rhyming slang for something not very politically correct. Aside from the usual meanings of the word, Green's Dictionary of Slang has raspberry-lander as Australian slang for Tasmanian, but that probably isn't what it meant.

Raspberry ripple: cripple. Obviously no person of refined sensibility would use such a term, or even recognize it.