london british prime minister theresa may appoint friday former member european parliament represent government brexit parliament upper chamber follow resignation incumbent medical ground brexit department announce martin callanan appoint minister state department exit european union replace joyce anelay hold role since june year delight welcome lord callanan department bring wealth experience brussels prove ability political leadership say brexit minister david davis callanan key role marshal brexit legislation unelected upper chamber may conservative party majority previously spend 15 years mep also work transport department resignation letter may anelay say worsen injury sustain 2015 force decision resign praise work government prepare brexit say certain negotiations would successful uk pm may appoint new brexit representative upper house