IMPORTANT UPDATE 28 Jan 2022: Unconfirmed reports in the Telegraph suggest the Treasury may close the working-from-home tax rebate microsite, so employees can no longer claim a whole year's rebate if they've worked from home at any point, even for just a day in this or the last tax year – similar changes would likely affect self-assessment claims too. While there’s no date attached, for safety, if you haven't claimed yet and are eligible, read below and do it now...
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If you are requires you to work from home, you've always been able to claim for
increased costs, eg, heat or electricity, for the specific time at home. Yet during
the 2020 lockdown,
HM Revenue & Customs (HMRC) launched a 'microservice' which, even if you only
needed to work from home for a day, allowed you to get a WHOLE year's tax relief.
More information can be found here
Viedo explaining how to claim below