youngoldbloke
The older I get, the faster I used to be ...
Good news!
Yes - I've tried that one. Must be me, but I find the on-map plotting really clunky - no undo button for example. I have recently been using http://gb.mapometer.com/ but the print out facility is really limited, and no OS map, but it is easy to plot route variations to compare distance etc, which is what I mostly want.I have come across this; it's a great substitute for BikeHike, in that you can have Google maps ( or various other options) next to an OS map. And you can save/import routes.
http://wtp2.appspot.com/wheresthepath.htm