So after a bit of fun in the mud when I indicate left or right all of them come on, I was told it might be a bad earth so I've checked the resistance on the earth's the front two have about 1 ohm and the rear two have between 2-3 I'm guessing the rears have a longer wire.

Any ideas?

It's a 88 plate 90 with a 200 disco TDI and they're wipac led indicators of that makes any difference