It's in ****ing Belfast.
Flights out there are £10 one way from Gatwick but it'd be a stopover on the way back due to either a short ferry and long 8 hour ride, or long ferry and shorter 5-6 hour ride.
I bought a new car from Belfast a few weeks ago. Got an early flight from City Airport with FlyBe and then took a ferry from Belfast to Cairnryan and drove back down all in the same day. I looked into the longer ferry but it started to get more expensive that way.
If you do get the ferry to Cairnryan then there are some brilliant roads to ride until you eventually pick up the A1. A712 in particular would be fantastic for a bike.