London manager Eamonn Phelan says competition for starting places is hotting up after they demolished Mayo by 14 points.
Phelan has rotated his side throughout the National League, and those who started at Ruislip on Saturday took their chance as the Exiles ended a two-game losing streak.
"Most of the lads have played inter-county hurling before, but they aren't taking their opportunities," said Phelan.
"So we're giving other lads a go, and I think today it started to drill into them."
Former Tipperary defender Lee Mackey impressed on his debut, as did captain Colm Quinn, while Martin Finn fired 1-6 in what was his first game of the year following knee surgery.
Finn's 16th-minute goal put London in control after a great start, but indiscipline allowed Kenny Feeney to drag Mayo back into it, his trio of late frees cutting the deficit to three points (1-6 to 0-6) at the break.
A fortuitous Quinn goal eight minutes after the restart put the game beyond Mayo. Henry Vaughan cracked home a third after Mayo goalkeeper Donal O'Brien blasted a penalty over the bar as London finished strongly with a flurry of points.
Man of the Match: C Quinn (London)
Scorers -- London: M Finn 1-6 (4f), C Quinn 1-3, H Vaughan 1-2, P Sloane 0-4, K Bolger 0-2, E Cooney 0-1. Mayo: K Feeney 1-8 (8f), C Freeman, D O'Brien (pen) 0-1 each.
London -- T Williams 7; E Walsh 7, B Costello 7, G Fennelly 7; M Walsh 7, PJ Rowe 7, L Mackey 8; C Quinn 9, K Bolger 8; P Sloane 7, B Smyth 6, H Vaughan 8; T Dunne 7, M Finn 8, L Hand 7. Subs: S Ryan 6 for Smyth (h-t), K Walsh 6 for Dunne (50), D Maher 6 for Hand (52), M Ryan 6 for Walsh (59), E Cooney 7 for Finn (63).
Mayo -- D O'Brien 5; A Brennan 6, A Connolly 5, S Connell 6; S Morley 5, D McConn 6, G Henry 6; P O'Grady 6, C Freeman 6; C McCrudden 5, D McDonnell 5, K Feeney 8; B Hunt 5, B Cullinane 5, S Hoban 5. Subs: C Charlton 6 for O'Grady (39), S Markham 6 for Hunt (60), F Lyons 6 for Henry (65), G Nolan 6 for Cullinane (68).
Ref -- P Murphy (Carlow)