The British Army is looking at assorted active armour protection systems including passive and active systems.
First up is the German MUSS system where sensors detect a threat and activate pyrotechnic or electronic countermeasures. MUSS is popular because it does not add much in weight terms.
Sources are suggesting 2018 as a date that the system may be fitted to Challenger II MBT's, with other armoured vehicles following...
https://www.gov.uk/government/news/a...r-armed-forces
https://en.wikipedia.org/wiki/MUSS_(countermeasure)