General Buggies I've personally tried in the 500

[Just Dirk]

These are the latest buggies available as of Sept 2013

Been out trying them today and can confirm the following fit in fine without removing wheels etc:

Bugaboo bee
Oyster (1 wheel off)
Maxi Cosi Elia

These definitely DON'T fit, whether or not removing wheels would make a difference I don't know:

Silver Cross Surf (wheels don't come off)
Mamas & Papas Urbo (wheels don't come off)
Mamas & Papas Mylo
Mamas & Papas Sola
iCandy Cherry
iCandy Peach
Graco Evo (wheels don't come off)

Mamas & Papas Armadillo didn't try as only front facing

Hope this helps someone

 

[The Twins]

These are the latest buggies available as of Sept 2013

Been out trying them today and can confirm the following fit in fine without removing wheels etc:

Bugaboo bee
Oyster (with wheels off only)
Maxi Cosi Elia

These definitely DON'T fit, whether or not removing wheels would make a difference I don't know:

Silver Cross Surf
Mamas & Papas Urbo
Mamas & Papas Mylo
iCandy Cherry
iCandy Peach

Hope this helps someone

Great info, thanks.
My daughter is expecting. As both me and my wife have 500's this could prove very useful indeed, I'm sure we will be called on for extensive baby minding. Can't wait!

 

[Just Dirk]

Haha.. My research is not yet finished either lol

 

[Just Dirk]

Bump for updated list