Answer:
Right now for UK nationals in UK colleges - £3300/yr (all universities same price)
Due to new legistlation, the cap ( £3300 ) has been removed and will probably rise to around £7000/yr for UK nationals.
For Internationals its more, for EU nationals I believe it's between Internationals and UK.
In terms of grades you generally need 3A's at A Level for most courses, probably 6-7 APs (or more) of 4.0+ , or 10+ IBs. Basically get As in everything