Inner tube valve broken? Please help.

Ok i did UTFS but apologies if this is a dublicate thread as i am kinda in a hurry!

I need to travel on my bike somewhere today and have a problem
I tried to pump up my rear tyre a minuite ago and when i attached my pump (Just a Beto hand pump) all the air escaped from the valve as i pumped.
It is attached properlly etc...and i have had this inner tube for about 3 months and the valve has been fine.
I have tried pushing the valve fiddling etc...still any air that goes in flies out again.
I do not have time or money to get bus to bike shop buy new inner tube change tyre do chain tension etc... and wonered if there is any obvious/basic quick fix to sort it out...
Cheers
Jack

(There is definatly no puncture, it comes straight out of the valve itself (The valve seems quite wobbly/loose??)

No.

new tube then >.< ?

might as well.

will save you time, figure out what is wrong later.

Ok thanks i guess. Damm Bike God...why today, when i really do have no time/money.

Wind up?

no i tried putting the wind up...it comes out... thats the problem.

WIlkinsons, poundland and decathlon are the cheapest places for innertubes, not sure if poundland do 700c though.

Ok cheers.

Wind up?

no i tried putting the wind up...it comes out... thats the problem.

ha ha. comedy gold that.

If you're near Southwark I can give you a spare tube.

cycle surgery. continental race28. parker int price match £2.50 (beat by a penny so £2.49)

Thanks!