Les and Claire wrote:

Hi Chaps!
Off to the Albert Hall in the new year (15th Jan) from
Folkestone in Kent. We want to use trains and tube... any tips? Looks like
Waterloo east is the handiest overground station for us to arrive at. Do we
just head underground and navigate as best we can to the Albert Hall?
Knightsbridge tube at a guess...

Where's the best Sushi too?

Are we missing something?

Yes. All trains to Waterloo East go to Charing Cross. You can get a
(frequent) 9 bus from there to the Albert Hall (which is quite a long
walk from any tube station).

If you insist on going by Tube then:
If the weather's good, stay on the train to Charing Cross then walk down
the hill to Embankment...
If the weather's bad, get off at London Bridge or Waterloo East and take
a Jubilee train to Westminster...
....and catch a District/Circle line train to South Kensington.