Thanks again, especially for trying to help me out with the ones you got to work.
I had tried that method but as I was using a form to post to get mapping directions the +to: etc just gave errors.
I found adding another input field as below worked.
<input type="text" id="saddr" name="saddr" value="" />
<input type="hidden" name="daddr" value="Gulworthy,Tavistock" />
<input type="hidden" name="mrad" value="50.545194, -4.209657" />
I just did not understand the APIv3 method of getting directions, especially where it fitted into the <head> in relation to the map code I already had there.
As mentioned I am using v3 to display a map but if you know of an example webpage where a basic map is shown, then a box exists for a variable(could be anywhere in UK) 'from' destination to a fixed destination, via a waypoint, I would be very interested to see it and try to use the code on my site.