Craig, what exactly do you mean by "stolen from me"?
Every main line BR station in London must be smothered with CCTV. If you were robbed or had left an "unattended package", it will surely have been spotted by the cameras so have you reported the loss?
Alternatively, if you have misplaced your bag then contacting the stations Lost Property office just might yield a result.
Either way, good luck with getting your records back buddy.
Moldie is right - how on earth did you manage such a precise list of what was in your playbox? Had it been me, I'd be struggling to remember what was packed so at least you've got a good start towards identifying your stuff.
There's a record fair at Spitalfields Market, just down the road, on Fridays (alternate Fridays?) which might be a good place to start looking if the theft is down to a local opportunist.
- Kev.