Well I have got back to the chao at the show room I went to visit and said can he not get it closer to 375 a month...hes getting back to me at 12 when they open. In all honesty id pay 380. Just want this thing ordered as a 21 weeks going to be a killer. Im being offered a good px at 18, 250 so as much as I could haggle more I dnt think they could do any better as its a new manager in gorgie road.
Dont fancy putting 500 down today though, never paid a deposit the last time until I collected the car.
Plus orangewheels have been sh*t at getting back to me. And id have to drive there and back. Its a 500 mike round trip... 
Well an extra grand saved + interest amounts to about £32 a month on Solutions, if you can get it it'll be worth it.
I'd be back onto the Orangewheels place/s, say you're ready to sign up now for £18k p/x. If they can't give a straight answer then or say it's too much, i'd give them a 24 hour ultimatum by saying (politely) "I have an offer in locally and if you can't get to Orangewheels price for my spec + £17.7k for my p/x i'll be going local, i'll give you 24 hours to think about it". £17.7k for yours will put you a grand better off than you have on the table with your dad's mate. He might bite there and then, he might bite the next day, or not at all. At least with that timeline in place they can only arse you about for 24 hours.
If need be, i'd get your car washed and looking shiny today, take some pics all round and offer to send them to the Orangewheels place via email to prove how well looked after the car will be (assuming it is in great condition). It's the end of their second busiest month of the year and October (probably their quietest) is about to start, they might want some new sales in Oct and be prepared to go ahead, depending on waiting until Weds to officially submit your order.
For an ultimatum like that it's your last ditch to save an extra grand (or £1300 if you're lucky) for that 500 mile round trip. Call their bluff and they say no then you'll be sticking with your Dad. I'd give VW Bradford a bell, they were my best CarWow quote. Without having to pay CarWow their cut because you haven't gone through them, you might get to £18k p/x and £3200 off (equivalent to OrangeWheels + £17600 off, or your Dad's mate's offer +£900 more discount).
For my last 2 cars i've never paid a deposit (I think due to the level of trust built up between me and my salesman of choice and bringing business in for my Dad's car), but this time around I have had to put £500 down, I think he's on a much tighter leash at the Durham branch than he was at Sunderland, Sunderland always used to be the preferred branch for a discount.