The hosts proved too strong for a London outfit forced to play all but the opening four minutes without red-carded centre-forward Lorcan Mulvey.
Though Limerick controlled the game and looked far sharper in attack, the sides were level (0-7 to 1-4) with Pádraig McGoldrick converting a 31st minute penalty following Damien Quaide’s foul on Eoin O’Neill.
Limerick had a penalty themselves moments after the restart but Seanie Buckley’s effort was saved by Declan Traynor. However, Ian Ryan found the Limerick net minutes later when he goaled following a Ger Collins’s pass.
The Shannonsiders were never troubled thereafter.
LIMERICK: B Scanlon; D Quaide, J McCarthy, L O’Dwyer; J Riordan, B Fitzpatrick, P Ranahan; S Buckley, S Lucey; D Treacy, E O’Connor (0-2), J Cooke; G Collins (0-2), J O’Meara (0-2), I Ryan (1-6, 2f).
Subs: S Lavin for D Quaide, Ian Corbett for Darragh Treacy (half-time), G O’Connell (0-1) for J Cooke, S Nix for S Lucey, M O’Keeffe for L O’Dwyer.
LONDON: D Traynor; S Hannon, S Bradshaw, D McGreevy; A Gaughan, S Mulligan, J Scanlon; S McVeigh (0-1), M Gottsche; C McCallion, L Mulvey, M Mullins; P McGoldrick (1-4, (1pen, 4f), S Kelly, E O’Neill (0-2, 2f).
Subs: P McDermott for S Kelly, S Doolin for J Scanlon, F Niblock for E O’Neill, F McVey for M Mullins.
Referee: K O’Brien (Tipperary).