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we put down a basic coopers brew the other day, it didnt bubble at all for about 2/3 days, and now is literally foaming all over the place, any ideas please??

Yes, it happens to us all eventually.

Three things:

1. Control the temperature, if possible
2. Use a blowoff tube and collecting vessel, instead of the airlock
3. Clean up as much of the external mess as possible. Clean, sanitise and reinstall the airlock

Beyond that, relax, have a homebrew etc etc.
You'll be fine. It's happened to me on multiple occasions, and I've not lost a brew yet.

thanks warra, we thought we would have to tip it out, will try your advice.

+1 on the temperature control. Aim for brewing at 18C (for ales, which includes most cans/kits) if you can. That will reduce the vigor of the fermentation, thus preventing the foaming that you've experienced, and also produce a better-tasting beer.

Cheers,

Oliver