Thank you both for the information.
I do have the controller and I've put a new set of AA batteries in it.
there is an on/off switch on the controller below which is the socket for charging the small battery .
on the front of the controller there are 2 lights -ready and charge.
I'm assuming that I connect the battery ,switch to on and the charge light should come on and when the battery has charged up the ready light should come on.
So far that seems logical.
However no lights come on ! The charge light did flicker at one point but no longer.
Probably the next step is to have a look inside the controller ,to see if there's corrosion /bad connections.
I'll have a look at the new battery website but since these planes are remarkably cheap it may not be worth the effort.
Thanks again for your help.
Gary