can any one help im wondering how a female bluey brindle staff and a male white with black brindle spots will turn out

Not up on staff specific but from lhasa colour genetics If the male doesn't carry the blue gene you won't get any blues, as both are brindle most if not all will be brindle. if the female has no white markings at all I'd guess you would get more solids and possibly some with some white if she carries white spotting.

To know more of what a dog may carry you need to know at least what the parents were.
However rember that colour alown is not the priority in picking a mating, there are health testing the breed needs befor breeding, so that's the first thing to look at, then finding a male that best matches her.

Stafford 'tones'? (:/

Depends on parentage and specifically which coat colour/pattern genes each of the dogs and their parents carry.  Like with all genetics, some are carriers (ie could pass on the 'blue' dilute colour) and some dogs are affected (would definitely pass on the 'blue' dilute colour).
The 'blue' colour in the SBT is caused by dilution of black. 

Much more important than colour (as has already been mentioned and should be the LAST thing considered) is health testing of the VERY overbred SBT breed.  Only extremely good examples of the breed, ie conformationally correct, impeccable temperament, fully health tested should EVER be bred. 

Education is key.

A little more here regarding genetics:
http://www.doggenetics.co.uk/dilutes.html