Tottenham Hotspur came up short in the North London derby against Arsenal on Sunday and that places even more importance on the summer transfer window. The state of affairs in North London was difficult to stomach for Tottenham fans. Arsenal raced into a 3-0 lead before half-time, picking off Tottenham with two set-pieces and a counter-attack goal. Tottenham hit back with two goals in the second half but it wasn’t enough to come back from that first-half deficit. Nobody likes losing a derby game but the manner of the defeat – especially after losing 4-0 at Newcastle United a fortnight ago – ce…