In the German night bombing raid on London of June 18th (1940), Blenheims accounted for five German bombers thus proving they were better suited in the nocturnal role. In July, the 600 Squadron from Manston had some of their IF’s equipped with A1 Mk III radar and with this equipment a Blenheim from FIU at Ford airfield achieved the first success with this radar.

This from http://www.battleofbritain.net

Moggy