Yes, I was talking about Chelsea Building Society. They are a good lender and as you pointed out, the Equiifax credit reference can be more forgiving than the Experian one. ofcourse, Chelsea isn't the only lender, but they use Equifax and are more likely to turn a blind eye to some negatives if some good positives are also being bought to the table.
Using a broker is a good way to go. Under FSA regulations a lender can only offer their range and you must choose yourself which is best. Ofcourse, the nice man in the Halifax isn't going to tell you that the Abbey has a better fixed rate, etc.
Whilst discussing mortgages, credit, etc (and I know this is going a little from the initial subject but still relevent), always ensure that you look at the fees payable, aswell as the rate. You don't want to pay a £500 arrangement fee if the interest rate will only save you £200 over the term. Many people are blinkered into finding the best rate, which isn't normally the best deal.
A broker should be able to do all this for you, and many you don't need to pay for this service, as the lender will pay them the broker fee for intriducing the business to them in the first place.