There's no doubt about it, Tiger Moths are god damn sexy.
When I think that I might have got my PPL on some Spam Can it gives me the shivers!
The Tiger Moths at Cambridge are £120 dual and £105 an hour solo.
If you think you'd enjoy learning on Moths more (and you would) then do! Especially as you live in Cambridge so it's only down the road.
I don't know what your financial situations like but I worked and saved up for about 2 years before I took my first lesson and it then took me 2 more years to get the license. I took a gap year before uni(versity) inwhich I worked full time and if it wasn't for that I probably wouldn't have been able to finish off my license.
If you want to fly cheaply then join the UAS next year ( if you have perfect eyesight), I would have if I could, otherwise just work through the holidays, I'm going to try to get a job like FNG described with Avia this summer.
By the way, is it true that you aren't allowed jobs during term time at Cambridge?