Can I do it?

[CellophaneGirl]

Allright, so in 5 days I leave.
I just recently found out that my program in England doesnt allow very much travel time (1 or 2 days) between classes and field trips, etc.
So I'm planning on adding a week and a half to see Ireland and Scotland.
Can I do it for $500 or less? Including hostels, transportation, food. And then I have to swing back down to London for my flight..
My parents said it has to be $500 or less or else I can't do it. =(
Just wondering if this was possible.
I have all my gear and clothes and everything.

Thanks everyone!!