There was a similar request from someone about a week ago from someone looking for cheap filing cabinets.
In an ideal world, the following deal would be available: -http://www.hotukdeals.com/item/308478/expired-reno-2-drawer-filing-cabine/
but this has expired. I've searched the usual suspects to include Asda, Tesco, Staples, Viking Direct, Argos but I appreciate there are better connected people out there who may have some options other than eBay for a 2 or 3 drawer lockable cabinet.
If it helps I'm based in Bolton so if anyone is local and has something gathering dust, I'll be able to collect. Best I've seen so far is £44 so thanks for reading and I hope someone's aware of a current/upcoming deal.