Joe Ironside gatecrashed Kieran Trippier’s party as League One Cambridge United dumped Premier League Newcastle out of the FA Cup at St James’ Park. The England full-back was handed a Magpies debut in the third-round tie a day after completing his move from Atletico Madrid, but celebrations over his arrival turned sour as Cambridge heaped further misery on Eddie Howe’s relegation-threatened side. Ironside made the most of some less than effective defending to score the game’s only goal with 56 minutes gone and Newcastle, who had earlier seen Fabian Schar and Jacob Murphy strikes correctly ruled out for offside, were unable to muster an effective response in front of a bumper crowd of 51,395. For the visitors, who sit in 16th place in the third tier, it proved to be a famous afternoon as they booked a place in the fourth round in fairytale fashion with keeper Dimitar Mitov producing a string of fine saves, one of them a stunning effort to keep out Joelinton’s injury-time header. ...