Buying 50 cars - Fleet purchase or dealer?

[uber]

If I wanted to buy say 50 vauxhall corsas would I be better to go direct to vauxhall fleet services or try and hook in with a dealer who purchases these in bulk and may get a better deal already? I have had a look around but it all seems pretty cut throat with contradictions on either side

[uber]

Thanks for all the feedback guys, seem to be making a little progress now