The mother of Britain's largest family has announced she has booked the date of the induction for the birth of her 22nd baby.

Sue Radford, 44, from Morecambe, Lancashire, and her husband Noel, 48, posted a YouTube clip to reveal they had a date in the diary to welcome the latest member of their family.

The mother-of-21, who is in her 29th week of pregnancy, gushed about her unborn daughter's 'brilliant' development as she filmed the clip in her car.

It comes after the pair said that after their last child in 2018 there would be no more.

Sue Radford, 44, from Hampshire, has revealed a date is in the diary for the end of her 22nd pregnancy (pictured, showing off her baby bump)

She said: 'She was doing brilliantly. Her head was measuring at 28 weeks, her leg was measuring at 30 weeks and so was her belly so she's doing really well.

'Her estimated weight is 3lbs 3oz, which is good because I thought she was smaller.

'She's still got time to have a growth spurt and she's growing really well which is brilliant.'

She added: 'We have an induction date, I'm not sharing that date but we know when she's going to be arriving it's in the diary.'

Sue, 44, and Noel Radford, 48, from Lancashire, are looking forward to welcoming their 22nd child into their brood (Pictured, Sophie, 25, Chloe, 23, Jack, 22, Daniel, 20, Luke, 18, Millie, 17, Katie, 16, James, 15, Ellie, 14, Aimee, 13, Josh, 12, Max, 11, Tillie, 9, Oscar, 7, Casper, 6, Hallie, 4, Phoebe, 3, Archie, 2, Bonnie, one)

And despite early concerns her unborn baby wasn't growing quickly, Sue said her bump was getting bigger and her daughter was moving around.

She explained: 'She's moving loads, loads more, she's really, really active now.

'She goes absolutely crazy the minute I get into bed and lie on my side she just goes crazy.

'I'm really pleased with the movement she's doing really well which is good.

'Obviously because she's got a bit bigger I'm now getting much more movement.'

After her latest appointment - Sue revelled in her unborn daughter's 'brilliant' development as she filmed a Youtube video in her car

The Radfords are already parents to Chris, 30, Sophie, 25, Chloe, 23, Jack, 22, Daniel, 20, Luke, 18, Millie, 17, Katie, 16, James, 15, Ellie, 14, Aimee, 13, Josh, 12, Max, 11, Tillie, nine, Oscar, seven, Casper, six, Hallie, four, Phoebe, three, Archie two, and Bonnie, one.

The Radford children Chris, 30, Sophie, 25, Chloe, 23, Jack, 22, Daniel, 20, Luke, 18, Millie, 17, Katie, 16, James, 15, Ellie, 14, Aimee, 13, Josh, 12, Max, 11, Tillie, nine, Oscar, seven, Casper, six, Hallie, four, Phoebe, three, Archie two, and Bonnie, one. Advertisement

They also have three grandchildren - who are Sophie's kids - Daisy, six, Ayprill, four, and Leo, two.

The family, who only claim £170 in child benefits a week, have to rely on Noel's bakery business to make ends meet and pay for their ten-bedroom house.

They bought it in 2004 for £240,000.

Noel had a vasectomy when the couple were expecting their ninth baby, but got it reversed so they could have more children.

The family now have to fork out £350 a week on food and spend three hours tidying up every night to keep their house in check.

Noel and Sue have to pay a minimum of £150 if they want to take the family out for dinner and going on holiday means bringing at least seven suitcases.

Washing duties are 'non-stop', with 18kg of clothes being washed every day of the week.

Sue revealed her daughter has been 'moving loads' as she said she had an induction date in the diary

They first shot to fame in 2008, when it emerged the baker and his wife were set to have a 'baker's dozen' of children, 13.

When it comes to going to the cinema, things can get very pricey.

History of the family December 24, 1970: Noel Radford was born March 22, 1975: Sue Radford was born 1982: The couple met for the first time when Sue was seven 1989: They welcomed their first child Chris 1993: The couple got married, and their second child Sophie was born. Children followed in quick succession ever since. August 2012: Their first grandchild was born after Sophie gave birth to Daisy July 2014: Son Alfie was stillborn October 2014: Sophie gave birth to her second child, Ayprll August 2015: Sophie married Joe Broadley December 2015: Sophie gave birth to her third child Leo Thomas June 2017: First child Chris welcomes a daughter, Maisie November 2018: Sue gives birth to her 21st baby October 2019: Sue reveals she is pregnant with her 22nd baby Advertisement

While many of us may scoff at the ever increasing price of a cinema ticket, spare a thought for the parents of 21 children, who say a single trip can set them back over £100.

Speaking exclusively to FEMAIL in July, the busy mother said: 'We do like to go to the cinema, especially in the holidays when the kids are a bit bored, it's raining and there's not much else for them to do. But it can be up to £10 per person so it can work out really expensive!'

Research provided by Compare the Market found that the average family spends £542 each summer holiday ensuring the kids are entertained.

And for the Radfords, trampolining is one of the most expensive days out - setting them back around £230.

'It's about £10 each by the time you've got the socks and everything so we do try to avoid doing that with them all,' said Sue.

In a bid to keep costs low, the mother-of-21, who also has two grandchildren, Daisy, six and April, four, Leo, two, looks anywhere she can to save the pennies.

'Believe it or not, we don't tend to get group discounts because we find family tickets are usually for two adults and two children - and obviously there's a lot of us,' she explained.

'We often look for the different discount codes you can find on the internet and go with whatever offers they've got on.'

Offering advice to other parents, she added: 'A lot of our best days out have been packing up a picnic and just going for a walk with the kids, or going to a park, or to the beach - and they're all free days out.'