Boris Johnson and his Irish counterpart Micheal Martin discussed post-Brexit trade and the Ballymurphy massacre during a meeting at Chequers, No 10 said. The two leaders had a working lunch at the PM's country retreat amid ongoing problems with the Northern Ireland Protocol set up in December's agreement with the EU. Anger in unionist communities over the protocol has been building since the start of the year as it impacted on imports of food and other goods. Last month violence spilled out across the region, particularly in Belfast, with people from both unionist and nationalist backgrounds taking part in riots. Mr Johnson is also facing nationalist anger over the 1971 Ballymurphy massacre, in which 10 innocent civilians were killed by British Army soldiers.