Digital Prints at ASDA (UK supermarket)

Hi all,

I tried a Sony fast print machine at my local ASDA store today, the 
bugger decided that what I really, really wanted was a nice yellow cast 
on all my finely lit snaps... cue "discussion" with the reprographics 
expert in store (er, young bint on nightshift, surely??) who was unable 
to proffer advice on getting the machine to print out my photos as they 
are rather than how it thinks they should be... it also transpired that 
there is no-one in the whole of ASDA UK that one can call to discuss 
their printing process and how it might be tweeked.

MyMate (tm) advises that the bigmachinebehindthecounter doesn't do 
yellow casts, unfortunately the bigmachinebehindthecounter is unable to 
talk USB either so I'll have to fish out my old Compact(hahaha)flash 
cards out and try again tomorrow.
Almost unbelievably, the two fifteen stone chavettes getting their 
smudges printed off of their phones were unable to help with my yellow 
cast issues. Mind, they had a bizarre orange cast in real life so I 
suppose they'd look reasonably human following ASDA's autolevelling 
algorithm...

What do the rest of the UK do to get decent digital prints?

T