I got put off with those type of ads afew years ago when I travelled across London afew times to have number say I need to pay a deposit for some bullshit reason.
Then subsequently, I would get random spam fishing calls for afew weeks before the number is lost or they give up. (this is why you need a punting SIM or Phone!)
HOWEVER!
Last may in Nottingham I was feeling a south Asain girl and saw a genuine Tamil girl -
https://www.ukpunting.com/index.php?topic=429508.0 Expensive at 120 for 30 mins but she had the heavy accent, the dark skin and even wore the Sari throughout. Big bum in a curvy natural way so I got her prone and filled her all the way up. Think she is permanently gone now tho but if she stayed in one location and local I would have made her a regular.
Ask for a postcode and look at it on google maps street view as a potential screening. Another is to bait them by asking “do you do bank transfer or cash only?”. If they say bank is preferable or they are hinting towards that, I always say “no I only do cash” and see what their response is. If they are adamant you only see them through “a transfer or deposit only”, I sack it off as a scam.