Transiting in the local area you'd get the RPS (and for the next area as you leave cos I'm good like that)
Transiting the MATZ 3000' or less and you should be politely requested or politely instructed
to set the QFE.
This is primarily to make coordinating departing or Radar pattern traffic a damn sight quicker and safer for all concerned.
If you want to stay on RPS fine by me. Just keep a good look out
That's notwithstanding CAS concerns. I don't have that snag.