There is only one terminal at Schiphol - everything is under the one roof. There is a division, though, between the Schengen area, and the international area.

You sometimes see references to T1/T2/T3 - but these are more correctly referred to as Lounge 1 (Schengen) and Lounges 2 & 3 (for non-Schengen flights, including the UK and Ireland) where the shops/restaurants and other facilities tend to congregate. The departure piers snake off from these various "lounges".

KLM flights to the UK usually leave from the D-pier gates - but could, in theory, depart from E, F or G too if necessary.