The headlights are a standard fitment 1989 Mini City.
Brake lights only cost a few extra quid, but headlight bulbs where quite a bit more (got them on sale though)
Brakes before:

P1030357 by alex.robinson18, on Flickr
Brakes After:

P1030364 by alex.robinson18, on Flickr
Both shots taken with the engine running.
Think you can see the extra brightness in the brake lights.
Headlights before:

P1030369 by alex.robinson18, on Flickr
Note the yellowness of the light produced
Headlights after:

P1030373 by alex.robinson18, on Flickr
Note the clearer colour of the light, as well as the increased intensity of the light.
In driving conditions, the new bulbs do make a difference. You can see further, and its a more natural light.
Hope this helps.