Filled my cash ISA - where to put money next?

[GroundEffect]

Going on from my mortgage thread, I've hit the limit of my ISA for this FY. RBS, my bank, are offering me a quick access savings account at 0.5%AER. That is rubbish.

What are my other options for sticking money in? Can I simply open up a bank account with another bank - one that offers better rates?

I need to be able to access the money in about 6-7 months so it cannot be tied down too tightly. I will be saving around £1300 a month on average (some months a bit more, some a bit less).