bingoboy, what doyou mean with
Basically grp A needs licensed fields which cost a bit and charge !!
I think you'll find that they don't. Some aircraft renters won't allow their aircraft to be taken to unlicensed airfields because of "insurance problems" but I can't think of any other restrictions on unlicensed fields.
To the uninitiated, don't think all unlicensed fields are tiny grass strips. Dunsfold's rather large runway is an unlicensed field....