Well, for one thing, I know Leicestershire Arts (the music part of the council - I think), do a scheme where if you buy an instrument through the school, then you don't have to pay VAT, and so get the instrument at a cheaper price. Talk to your music teacher at school about this, ask whether a sax teacher comes to your school.
I found some websites which might help you:
* Arts in Education site -
http://www.leics.gov.uk/artsined* Instrument Tuition page from Leicestershire Arts -http://www.leics.gov.uk/new_servicepagestheme.htm?initial=&pid=51&theme=T3
If you need any help, then let me know