Re: Homemade Jumps!
If you can find any barrels, they are really useful! I found two small (about 2ftish) barrels and they make great cheap jumps :) Also if you have any old long tree branches these come in really useful as poles. Most of my jumping "poles" are branches! 
If you can find any traffic cones (I know, sounds weird, but I found two!), obviously not in use (!), these make great jumps stands, fillers or bending cones. :)
Also for small jumps if you have or can find in many cheap bargain stores, cheap plastic bins like wastepaper bins and ones you would use in your home, I'm sure you could find some for less than £5 for two and use these? :))
Anyway, hope this is useful and good luck!! ;)