I have a 2002 Octavia Ambiente Automatic with the 1.9TDI ALH engine

I've been trying to find which discs and brake pads to buy but its a nightmare

Eurocarparts have all these sizes "that fit my number plate"

256X22

280X22

232X9

288X25

256X22

280X22

Pagid and Eicher

ETKA says that its one of these but it doesn't say which

1J0615301L,E,M 280X22

1J0615301R 288X25

6R0615301A 288X25

8N0615301A 312X25

Can anyone tell me which discs/pads to get please?

Ideally eurocarparts as its cheap.

I'd ask your local dealer to check. Have you looked at your calipers etc. If they have FSIII on them, then they are likely to be 280 or 256 mm. If not then I'd guess 288mm. They won't be 312mm.

Have to measured them?

Yours 'should' be 280x22.