Hi Neil
Now you need to go to Edit, Unslect all
then open in point mode and do the same
you don't want anything selected when you apply the texture
you just want to have the part you want to texture as the current part (but not with any part of it selected as such
you must be in Part mode when you texture
it won't texture in point or poly mode
I am running out of PMs so best keep messages in here mate as i have 200 PM s now

(not all from you mate)
Regards
Rick