Under the existing tax relief system, workers can claim between £1.20 a week (£62 a year) and £2.40 a week (£124.80 a year) if they have been working from home.

Analysis from the charity suggests around 1.16 million people have been working from home during the pandemic and would qualify for the relief.

CAS analysis comes as the energy price cap is set to rise, with increases of £96 for default tariff customers, and by £87 for pre-payment meter customers.

Kate Morrison, CAS fair markets spokesperson, said: “Over 1 million people in Scotland who have been working from home during the pandemic could be entitled to this tax relief, so we’re encouraging everyone to apply.

“Lots of us have been working from home during the pandemic and will have had the heating on for much longer stretches as a result.

“Any money saved on bills will be especially welcome having come through a cold winter which pushed up heating demands, on top of today’s energy price cap rise which will result in price hikes for many households.”

She added: “This relief isn’t perfect – we’d like to see it reviewed and increased for people on lower incomes who are more likely to be living in fuel poverty in the first place. If home working becomes more widespread after the pandemic then this relief could become more important to lots of people over time.

“We would also encourage people to check www.MoneyMap.scot to see all their options to cut their living costs and increase their incomes.”