So I thought I'd physically check and see what bulbs I've got in there, and the headlight unit is bloody loose. Looks like I now have to take the (add expletive here) thing off and see what's occurring. Offside dipped beam lamp outside edge moves about 3mm in & out as if it's not attached. Nearside is solid by comparison. I don't suppose anybody has any pics of the fixings, or I'll have to scan YT.