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just by a Danfoss or Honeywell S plan kit and an extra thermostat the Greenstore unvented will come with a zone valve as part of the kit.
You cannot control your hot water temperature from another source it is controlled by the thermostat that's situated on the side of the cylinder. set to about 60 65 degrees.
Obviously you will be able to control it via the programmer that I presume you will wire up in a convenient location and not in your loft.
It would be a good idea to ask your plumber what the best deal he/she can get on the control packs as there merchant may be doing special offers.