My call is officially M#7DSW with M7DSW being the call I use at my QTH. I have added M7DSW/P as a secondary call for when i am operating portable and this was no problem but say (after lockdown) i went to activate a local SOTA summit that is just over the boarder into Wales. I would have to operate as MW7DSW(/P) as soon as i crossed the boarder. is there any way to add MW7DSW as a secondary call in the same way as i can add M7DSW/M for exmple?