@KevAttree the extender needs to be halfway between the hub and where you need the boost as you hsvectwo areas it sounds like you need a second extender. If younpsy for Sky's WiFi Max or Broadband Bosst bundles they should supply a second one if asked. However like many homes you maybe better off buying your own WiFi mesh system and use that instread of paying Sky. I do that myself as my hime needs 3cwifi sources to give good coverage.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
