If the price is too high, or increasing to a price out of your expectation, walk away. Stick to your guns.
There are plenty houses for sale at the moment, even for the next couple of years. They are lucky if they could find a buyer.
The agency's commision rate is 1.3% to 1.5%, even if they increase the price by 163;5000, they only get 163;36 to 163;75, it is negligible.
I think that Mr Busy is messing you about.Just tell him, you feel you have been mistreated,and walk away. that's his loss.
Remember you have the money, you are the god.