The taxi company I used in the end was Surburban Taxis (Des told me about them as they didn't do taxis)
Their number us 131008.
I ordered taxi for 4.45am and they were here at 4.35 am and just waited for me. I didn't call either to make sure they were on their way. Really canny bloke and got me to the airport well in time
I would recommend them. Also pulled right up to the front door as it was pouring!