Mr Gooner, I'm disappointed in your lack of enterprise! Three cans of expanding foam would have sorted that. Spray it in, push the cab door closed, lean on it nonchalantly for about five minutes, then tear away any stuck down clothing, saunter off and the job's a good 'un.
As it is, VM will just send out a tech to fit the patented "Virgin Media Duct Tape Lock" that has a half life of three weeks.
Excellent news that this will now be professionally attended to.