I had tried that, but it said that there was no map for the UK keyboard. I've had a slap the forehead moment though, because originally when I tried that I couldn't find where on the pc all those DOSbox files were that come up when you invoke the program, so I couldn't work out where to put the keyboard.sys. However, of course, you can put keyboard.sys where you mount the c drive and then run keyb from the z drive. Duh!
That works now - thanks very much!
BTW, is it right that the only way to give focus back to Linux is to exit DOSbox altogether?! Or is there an arcane set of keypresses to get back to Linux? 😀