Ah ok, well bin is somewhat arbitrary binary files so we need to know what format binary it can take. I was sure wilbur or something could read arc ascii. I can generate .BT, .HF2, a RAW which is also pretty arbitrary or just do a greyscale which looses a lot of info.

I have been coding up the script to run it against all the tiles they supply, then render out the height maps, then shade them using the MEDem procedural shader to get a view of the whole UK. Here is a pic or two - click for improved size. There are some irregularities near to sea level and this has no bathymetry data in it so its hard to shade against that. It seems Norfolk is below sea level in this data - I was not sure that was the case but maybe it is. It may also be that the sea level is not a constant at 0 and its using the Newlyn Datum which may mean that the sea is higher to the right of Britain - Not sure at this point...