Are you talking about a Bacta Tank?
I would like to hope that you are kidding?
£30? you sure it wasn't £35 https://www.hotukdeals.com/deals/alpkit-brukit-for-35-from-alpkit-3010183
Yea, for £45 quid. Muppet
Was hoping it's one of these nice things that jump into to speed up muscle recovery.... Needless to say, cold from me.