If this £9000 is inc VAT, then it is £7500 plus VAT. That leaves around £5500 going off your figures which 'could' represent any amount of time dependent on his rate. The only person who can answer that is himself.
I cannot see him having any issue telling you his day rate/hourly rates. I would agree with the above though, I personally would not break down my estimate too much for all sorts of reasons.
We are in business to provide a way of life and earn a living. We have all manner of overheads to take into account. Having said that, I can't remember any customer asking me to break down an estimate. They normally take it or leave it.
As far as rads go, he probably has his preferences as we all do. There are many different levels in quality and the internet is no use to compare unless it is like for like, a rad is not just a rad, if you get my meaning.
If the trust is not there at this stage, then my advice is to move on.