Hi Chris,
Glad you put that last post in today... (about this topic not having been answered!) No disrespect to anybody, but the thread just seems to have 'waffled' on!
Have to say though - and this probably contributes as to why the question is still unanswered; don't understand the bit about driving a 'Bread Van'??? What vehicle are you driving as you don't state this? Also, wannabeahack did ask what tyre size??
Assuming you're driving a 'real' taxi - i.e. LTi or Metrocab, or even an Asquith!!! - and not a 'parts delivery van (Peugeot E7 or similar) or a mini-cab (i.e. a saloon car masquerading as a taxi!), then you will be running 175/16s.
(The profile is not shown (usually) as it's the full 80% and is only shown (usually) if it's anything less.)
You also don't state where you're based? So we can't recommend places to buy!
After years of trying different tyres on my 'taxis', I've settled (along with many local to me) on Austones. I shunned the idea of these, what I though to be budget tyres, when they were first suggest to me by a colleague. Now I swear by them! They are excellent in dry, rain and snow (love driving in snow!)
I buy mine in Bristol @ Ablefit. They cost £42.95 each fitted & balanced. That is about 2 thirds of the Dunlop price, and they last about 2 thirds of the mileage, so that equates to the same money - but I think they are better (sorry Dunlop)!
If you can't buy them from even the likes of Kwik-Fit (albeit a little more expensive) then you must be living somewhere very remote!
Hope this helps, darth.