London & the South East dominate the least affordable areas, with mortgage payments in Kensington & Chelsea typically standing at 76.6% of disposable earnings.
Overall, mortgage payments have nearly halved as a proportion of income over the past 5 years from a peak of 48% seen in the autumn of 2007.
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Monday afternoon's forecast for the east of the region
Monday afternoon's forecast for the west of the region
The RMT Union's comments come as it's announced a new operator will takeover the South West Trains franchise.