No I haven't - the main problem is that I don't live in London, so a dedicated trip would be required to go and see her.....I tried to arrange a booking last week (for that evening) and eventually got a 'hi' in response three days later.....sent another message yesterday evening and not long later got a 'hello baby' in response but then nothing further.....I wonder if her phone simply rings/pings incessantly (perhaps she just mutes it when not available because messages I send always get through) and it's just luck of the drawer in terms of who actually gets to see her. Re phoning, do you know whether she has reasonable English - if she does then (provided she answers) that might be a more effective way of tying her down 
I am afraid that getting hold of her will continue to be a challenge. Not so long ago she worked near me in West London and seeing her was easy and I met her a few times. She charged 100/150 at the time.
She is now really focused on longer bookings and once she gets one, I think she ignores the phone until it is time to look for a new booking and she goes down the list of requests and prioritises longer bookings.
Her late responses of "Hi" are customary.
She gets away with this because, firstly she looks great, pretty face and great body with a huge cock and a great ass. She is also a great kisser. Whilst she is versatile, she really likes topping and is very energetic.
In person, she is warm, welcoming and so sexy. Nothing is too much trouble and she will cater for all your wishes and desires.
Whilst she has everything at her disposal to offer her clients, she herself remains free of any substance use and keeps up a high level of performance.
Her weapon is not for faint hearted. We were both very horney one evening and she let that weapon loose on me. She became very dominant and forceful and took my pleas of a slow down as a sign to double her efforts. She later told me that she gets really turned on when someone asks her for mercy like that.
I suggest you continue trying. The times you are likely to get her for a short meeting is early afternoon on the off chance that she is checking her phone. If she is free and in the mood, she will take the booking.