It was a fine return to form for the Exiles, who had so far disappointed during their current Premiership campaign and demonstrated the enterprising, fifteen-man game that won them many admirers last term.
Irish crafted four tries during their home victory, through Barry Everitt, Paul Sackey, Ryan Strudwick and Kieron Dawson and will be particularly satisfied with the control shown by their pack throughout the encounter.
The game got off to a furious start and, while Saracens took the lead after 11 minutes through a penalty by Fiji international Nicky Little, it was Irish who looked most comfortable as their forwards began to rumble forward.
Eventually the pressure exerted by Irish enabled fly-half Everitt to go over for his side’s first try, which he also converted.
While the Exiles could not convert further pressure into points for much of the second quarter of the match, with their composure deserting them on a number of occasions, in the dying moments of the half, wing Paul Sackey improvised a brilliant score to stretch his side’s lead.
After a turnover deep in Irish territory by Saracens, a delightful counter-attack saw Sackey chipping ahead, regaining possession and then sprinting clear for a memorable try to take the score to 15-3 at the break.
The second half saw Irish again in dominant form, with captain Ryan Strudwick showing good strength to score his side’s third try.
Irish international flanker Dawson completed the Exiles’ four-try spree just before the end of normal time, thus securing a bonus point for his side.
While Saracens centre Kevin Sorrell scored an injury-time consolation try, converted by Andy Goode, the day belonged to London Irish.
The scorersLondon Irish
Tries: Kieron Dawson, Barry Everitt, Paul Sackey, Ryan StrudwickCons: Barry Everitt (3) Pens: Barry Everitt (2)
Saracens:Tries: Kevin SorrellCons: Andy GoodePens: Nicky Little