By Jude Summerfield Pep Guardiola took responsibility for Manchester City’s defeat to local rivals Manchester United in the FA Cup final on Saturday, claiming he got his tactics wrong at Wembley Stadium. The Cityzens were favourites to claim the double after winning the Premier League title last weekend and had easily beaten United in their two previous domestic meetings in 2023/24. However, Josko Gvardiol and Stefan Ortega’s blunder handed Alejandro Garnacho the opening goal and fellow teenager Kobbie Mainoo made it 2-0 heading into half-time. Substitute Jeremy Doku did half the deficit as he…