We are currently exploring ways to work with the great Pebble team at "School Fundfinder" http://www.mypebble.co.uk/en/sff/
They offer schools a great service for a low fee that will enable you to find sources of funding and ideas for fundraising that will help with school links (and other things as well).
Contact Ross at email@example.com - say you are part of the UK Jamaica Schools Links project - and they will be able to advise you how to link with them.
You can check this out https://www.mypebble.co.uk/media/brochures/SFF_brochure.pdf
Let us know if you have worked with Pebble, so we can build up some endorsements.