Thanks to private help and advise by George [ananda] problem is finally solved.
George allowed me to use his version of ES St Marys airport for the ES Scilly Isles addon scenery which works great when you add a created folder containing the flaten bgl file which must be added to the P3D V4.4 scenery library and moved to lie below Base000.
Thanks to all other members for their input too.
Presently I am unable to post more than one screenshot at a time ?? why. ? Using only free post image hosting site.
Thanks again George
Monir