Was reading an article in a magazine about daytime MoT certification being available. Covers all the same stuff, but doesn't cover side or headlights. Was in relation to a track car which didn't have headlights at all.
On a practical note, if you do get pulled by a plod, you'll poss get a rectification order to fix it.
I drive from Exeter to Peterborough in a car with no bonnet or front bumper a fair few years ago. I asked a friendly plod about it and was advised that as long as it showed a number plate it'd be fine so I stuck it to the front of the car with duck tape. No trouble despite passing much plod in the days you actually saw them.