Possible intended robbery

I am a pre-op transsexual female sex worker.
On Wednesday 21 October2011 at 16:30 "Paul" had a brief phone conversation, with me from an ad in the local paper.
He was at Hatfield Asda's.
(During the phone conversation, all he wanted to know was my address and an immediate visit wanted. No enquiry by "Paul" about price or services offered.  I described my body and services and fee. He seemed disinterested in those details. (Normally I'd refuse such a dodgy sounding approach but I was distracted by other things not related to this phone call, so I totally missed this)

Ten minutes later he visited me.
On arriving in my locality, "Paul" rang for final location. He kept asking my house number while making it clear he didn't want his car seen for his security reasons. I made it clear I had the same concern for my welfare. He replied 'My security is more important'
He turned up a couple of minutes later after agreeing to drive to my location.
Upon arrival, and me opening the front door to my 1st floor flat,
he bounded up the stairs  before I could ask him to remove his shoes
(a safety thing I request all my clients to do, so this made me concerned)
Upon running up after him, he was in the lounge scoping out the flat, looking at my possessions and the internal closed doors, rather than looking at me. From this point on he was very jittery and on edge. (another warning)
Then he said 'Have you got everything we need?' and repeated this a few times.
I was wondering if he meant drugs or condoms or what so I asked
if he meant condoms. He replied 'You've got a pussy, yes?'
I replied that I had a penis, and had explained that ten minutes earlier in our phone conversation.
"Paul" 'Ok lets see it then'
Me 'Money first'
"Paul" 'How much'
"Paul" 'What about half hour?'
"Paul" smirking but still looking on edge 'That's a lot of money for half hour; how much for 15 minutes '
Me '120 It's academic, as you're leaving.'
As he walked down the stairs he stopped, turned round and said
'You're really nervous of me'
Me 'Not as much as you are of me'
He then left without incident.
His mobile number is 079518867--
BMW 4x4 car Black Very heavily tinted windscreen. Reg: KL56W--
"Paul" is white short brown hair. Street sport wear dark in colour. Age maybe mid to late 30's.
Tattoos on arms, hidden by top but part of them visible on both wrists.

This may just be an apprehensive client
but I really feel this was something else.