Hi and

Maz.
As others have said, the Carrera's are quite well regarded on here as being some of the cheapest decent bikes on the market.
My tip for getting started in cycling is to get your saddle height right. New riders tend to have it set way too low (thinking you're supposed to be able to put both feet on the ground when seated) which makes riding hard work and puts strain on the knees.
Enjoy it and let us know how you get on.