TORA: 'The length of runway declared available and suitable for the ground run of an aeroplane taking off' (includes any displacement). Published in the AIP AD2.
Tea and medals for Paco.
LDA: 'The length of runway which is declared available and suitable for the ground run of an aeroplane landing' (excludes any displacement).
Example - RWY 03 Cranfield (EGTC) TORA: 1799m, LDA: 1594m
ASDA: TORA + stopway
The displaced threshold only comes in the TORA calculation given in AIP AD2, so you won't have to consider where to 'add' a displaced threshold, just know what markings you are looking at on the ground.