Boris Johnson's sister has bragged about her heavy drinking during lockdown – despite her husband having had a liver transplant.

Rachel Johnson claimed she drinks every night most weeks.

Her husband, consultant Ivo Dawnay, had a liver transplant in 1995 after he was diagnosed with Hepatitis C and cirrhosis.

The Prime Minister's younger sister wrote: "It made lockdown much more bearable, but the problem was, we did this without fail every evening.

"I never gave my liver a night off – I gave it a hammering.

"'Did I drink too much during lockdown?' I asked my husband. 'Am I drinking too much now?'

Rachel Johnson has boasted of lockdown drinking binges with her husband Ivo Dawnay

"I waited for his answer. I should point out that my husband likes a drink and would never be first choice to run the UK Temperance Movement.

"'Not nearly enough!' he replied heartily, as he pressed send on his Wine Society monthly order. (He has a fresh, pink, reasonably new liver thanks to a transplant by the NHS and therefore thinks that he can start all over again)."

Ms Johnson, 55, married her husband in 1992. The couple have three grown-up children together.

Rachel Johnson with her brother, Prime Minister Boris Johnson

The journalist said she had put on half in stone in weight during lockdown and admitted she knows "how bad drinking on a regular basis is for the body".

When wondering whether she was drinking too much during the coronavirus lockdown, she answered: "The real answer is yes. I drink every night most weeks. I went out to dinner last night, for example, and had a cleansing Peroni followed by two fortifying large glasses of red.

"I try not to drink to excess (six or more drinks in one session, according to the questionnaire), but I find it hard to get through an evening without a large relaxant of a large, cold glass of white Burgundy.

Rachel Johnson admits she has been drinking excessively over the coronavirus lockdown

"I want to drink less, but find it hard not to drink. When dry, I want to hurl plates at my family by around 9pm – and cannot resist temptation.

"On the plus side, I've never drunk in the morning, or to oblivion ever since I threw up as a schoolgirl all over a wine bar in Kensington.

"I sometimes want to blurt out, as I see my husband bustling towards the fridge at happy hour, that I would find it easier not to drink every night if he occasionally had a night off, but he ignores this fanciful notion."