Help me choose the most suitable ISP

[Faded]

Okay so here is the situation, my sister needs the net to work from home, she wont be bothered at all by download limits and will pretty much just be using it for general browsing and connecting to a work server.
What is the best ISP regarding value for money, if anyone knows of any providers that provide a 'rolling contract' service that would also be very handy.

Thanks in advance.

 

[Faded]

No Orange or Sky I'm afraid.

Any reccomendations? Reliability is essential due to the fact that she can't afford not being able to connect when she needs to do work.