Looks like a Machine mart one, I was looking at them last week, not bad for the money. Clarke Premium Tool Chests - Machine Mart
I thought it might be Clark, but Clark quality seems better than this one........I got it for £90 new, six years ago...........Should have got two, looking at the cost of them now........almost double that, regardless of which make it seems.
I'd say Clark. They do sell cabinets that range in quality, I have one of the "pro" ones and they are a lot better than the basic toolboxes, still decent quality on the lower end of the scale though
the cheaper ones are more than fine, been using a cheep bottom roller cab for the last 15years hard life still perfect with a heavy snapy box on top. just sold it for £100 to the lad. picked up one of these with a grinder and pillar drill sill in there box for £400 last month. massive good quality.