The problem with self cutting taps is they make a tiny hole about 3 or 4 mm to get the water through, so you end up with slower filling machines.
This being said, they do work and offer a simple solution to fitting an appliance, if you have room you can fit a "Y Piece" ( see pic below) this will give you 2 outlets, but make sure you have enough room and it's in a place where it won't get knocked, at these are so easy to break and you end up with a wet floor. You might find it takes ages to fill if you have your WM and Dishwasher on at the same time though.
There is nothing to stop you using another self cutting tap, But if you have room go for the option above.
Thanks for the tips. I've bought one of those screw in wastepipes, which has an end for a washing machine and a dishwasher (currently I just hook the waste pipe from the washing machine over the sink).
However, I've not clear how the various pipes fasten to it, I though it would be obvious, but now I've looked at it, it's not. I'm starting to wonder if I should stick to doing the dishes by hand!
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