Sorry for the delay SMW, not been on for a while rather busy at the moment with work, home etc! Your car books at £1075 CAP clean & £850 average! You will find most dealers would stand it at about £850 even if it was in great nick!
As for profit in a new car on Toyotas, dealers get 5% up front margin then around 5-7% "back end" margin depending on sales figures, standards etc
I know dealers who would give you most of it at the right time ie: coming up to the end of a quarter march,june,september & december. Others wouldnt give you a penny off ever!
I currently work for a Nissan dealer & we get 4% & 4% on most models plus various other discounts on top of that ranging from £200 to £1500+ depending on the marketing support at the time.
As for finance, it can depend from dealer to dealer as they are all on different rates. On a car upto 24 months old I could give you a rate of 3% flat & still earn a little bit of commission!
& dont be fooled by 0% deals, who can borrow money for nothing? Most dealers pay a hefty subsidy for 0% & would be more than happy to offer you an equivalent discount instead!