Northampton director of rugby Paul Grayson:
"Jon Clarke dropping the ball at the end when a try was on summed it up.
"If that try had mattered I would have been worried about the decision but it didn't affect the outcome of the game.
"There was no lack of effort from the boys. They came off exhausted. We
looked tired in the last 20 minutes."
London Irish: Horak; Armitage, Mordt, Catt, Tagicakibau; Flutey, Hodgson; Hatley, Paice, Rautembach; Casey, Kennedy; Roche, Dawson, Leguizamon.
Replacements: Collins, Flavin, Gustard, Murphy, Ojo, Willis, Pedro Tiesi.
Northampton: Kydd; Rudd, Clarke, Quinlan, Vilk; Spencer, Robinson; Smith, Richmond, Budgen; Damien Browne, Lord; Tupai, Harding, Daniel Browne.
Replacements: Hartley, Emms, Gerard, Fox, Noon, Howard, Pritchard.