JDMarco
Just go round there and wave £4000 under his nose, show him what it looks like in the flesh, If he says no another £2000 should sway him, but like you say if you really want it and it fits in with yours, just pay what it takes.
Tell him to let you know what the highest offers he has had, watch out for the bull, not everyone has the balls to pay that kind of money for a round, so the odds could be in your favour.
£24k a year is a lot of EXTRA dosh to add to your turnover every year.
Just make sure you win it , good luck.
Dave