What size dish for Yamal 402?

Hi, for you maybe 1,80m and only get, Ku-Band Norhern transponders.

I think 2.4m dish

Don't forget that Yamal 402 is only 12 above the horizon in London and if you have an offset dish, it may be easier to flip the dish upside down and add the 24 degrees to the dish than to try and point it -12 degrees below the horizon.