Kat wrote:

I'm fine at showing people best routes to use on the Underground but
does anyone have any ideas about the most useful ten/twenty bus routes
to learn?
The ones I know well are, 279, 253, 29, 8 (plus 25 and other local ones)
TIA

One of my faves:

19

Finsbury Park
Highbury
Angel
Tott Ct Rd
Picc Circ
Piccadilly
Hyde Park COrner
Knightsbridge
Sloane Square
Battersea