I wonder if they will apply this approach to minimum income thresholds for spouse and fiancee visas?

"Benefits rates could vary according to where someone lives, under welfare changes David Cameron is considering.

No 10 says the prime minister wants to look at whether it still "makes sense" to set payments at a national level, given differing regional pay levels.

Although he dropped the idea from the final text of his speech on welfare, No 10 says it is among ideas which also includes cutting benefits over time."

http://www.bbc.co.uk/news/uk-politics-18575453