Theres so many transponders off at 28E now they almost certainly dont need 3 satellites there any longer. Any even if one or more birds is left to run inclined it'll be a couple of years until the inclination starts getting bothersome for the small dishes in use in the UK.
However, I think SES has at least 1 space tug mission booked with no announcement yet as to which bird will be allocated the extension.
So even if SES dont replace any of the birds at 28E, itll be a few years until things start to wind down.
Id be surprised if there is a future announcement of 2H, as I doubt theres enough long term life left in the 28E slot, although with SES's recent mergers theres plenty of capacity could be shunted into 28E for a few years service to keep things ticking over.