From Keith Vaz wiki page.
"Keith Vaz, who lives in Stanmore, a 45-minute journey time from Parliament, claimed mortgage interest on a flat in Westminster he bought in 2003"
Stanmore is on the edge of London.
Plenty of people commute from Stanmore to central London every day, some commute from even further out.
Why on earth does he need a second home IN London (on expenses) .
Surely for the few times he needs to stay late in London he should stay in a hotel rather than we having to pay his mortgage on his second home.