If you are looking to take the licence route, I can recommend the on-line course run by Essexham.co.uk
You will need to create an account and apply to join the next available on-line course -
http://www.essexham.co.uk/foundation-online . The members there add a few parts of the curriculum every few weeks so that there is never too much to study!
I am going through the course at the moment and hoping to get the practical side of the examination done before the summer
There are recommended publications which detail the various frequencies and availability to stop you transmitting on reserved frequencies that might warrant a visit from Offcom. Overall theres plenty to learn and has been enjoyable so far.
ATB
Ogri the trog