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Mark Said:

who is the uk's biggest mortgage lender?

We Answered:

Historically it has been HBOS (Halifax Bank of Scotland) with a share of 18-21% but they had a disastorous 2007 first half with there share of the market slipping to 8%. (They have said they expect this to recover though back to the levels mentioned above)

Otherwise Nationwide (Approx 20%)
Northern rock (Approx 19.5%) (Note they in the top 5 but I think they are better placed than 5th)
Woolich- 8%
Bradford & Bingley- 9%
HSBC- 3.5%

PS- I work for HSBC