Questions for UK controllers

[Mr Falcon]

Please could someone clarify the following for me ? I work in the simulator and am conscious to use correct R/T. I've checked CAP 413 but would like to clarify :

If you are vectoring an A/C for a NDB/VOR /GNSS approach is the correct R/T from ATC :
" C/S report established on the final approach track "

If an A/C declares a Mayday or Pan , is the correct ATC reply " C/S ... TWR..roger mayday "
and you then standby for the A/C to contact you with further instructions ?"

Does the A/C C/S then become " MAYDAY C/S " or " PAN C/S " automatically ?

Thanks very much.