Night routes from my area:
Chingford - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N26 to Chingford or the N35 from Brixton to Shoreditch and then the N26 to Chingford
Cockfosters - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N91 to Cockfosters or the N35 from Brixton to Holborn and then the N91 to Cockfosters
Edgware - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N5 or N113 to Edgware or the N2 from Brixton to Victoria and then the N16 to Edgware or the N35 from Brixton to Tottenham Court Road and then the N5 to Edgware
Enfield - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N29 to Enfield
Hainault - The N3, N109 or 159 from Brixton to Oxford Circus and then the N8 to Hainault or the N35 from Brixton to Shoreditch and then the N8 to Hainault
Harrow Weald - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N18 to Harrow Weald
Heathrow Airport - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N9 to Heathrow Airport
High Barnet - The N3, N109 or 159 from Brixton to Trafalgar Square and then the N20 to High Barnet or the N35 from Brixton to Tottenham Court Road and then the N20 to High Barnet
Northolt - The N3, N109 or 159 from Brixton to Oxford Circus and then the N7 to Northolt
North Finchley - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N13 or N20 to North Finchley or the N35 from Brixton to Tottenham Court Road and then the N20 to North Finchley
Romford - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N15 to Romford or the N35 or N133 from Brixton to Monument and then the N15 to Romford
Stanmore - The N3, N109 or 159 from Brixton to Oxford Circus and then the N98 to Stanmore or the N35 from Brixton to Holborn and then the N98 to Stanmore
Uxbridge - The N3, N109 or 159 from Brixton to Oxford Circus or the N35 to Holborn and then the N207 to Uxbridge
Waltham Cross - The N2, N3, N109 or 159 from Brixton to Trafalgar Square and then the N279 to Waltham Cross or the N35 from Brixton to Tottenham Court Road and then the N279 to Waltham Cross
Walthamstow Central - The N2 from Brixton to Victoria and then the N38 or N73 to Walthamstow Central or the N3, N109 or 159 from Brixton to Piccadilly Circus and then the N38 to Walthamstow Central or the N3, N109 or 159 from Brixton to Oxford Circus and then the N73 to Walthamstow Central or the N35 from Brixton to Tottenham Court Road and then the N38 or N73 to Walthamstow Central
Woodford - The N3, N109 or 159 from Brixton to Oxford Circus and then the N55 to Woodford or the N35 from Brixton to Shoreditch and then the N55 to Woodford