A woman was left stunned when an anonymous stranger posted a card with £100 through her letterbox as a reward for being a good mother.

Sarah Bartlett, 37, from Sidcup, London was in 'utter shock' when the cash appeared in the post at 1pm on Sunday.

The money was posted to the mother-of-three with a card explaining it was a gift in recognition of the 'amazing job' she was doing of bringing up her children.

Sarah Bartlett, 37, was in 'utter shock' when she found a card posted to her anonymously which praised her for doing an 'amazing job' of bringing up her children

The message which accompanied the £100 read: 'Darling Sarah, from another mummy who has noticed that you do an amazing job, enjoy the enclosed, for you. Be blessed'

The message read: 'Darling Sarah, from another mummy who has noticed that you do an amazing job, enjoy the enclosed, for you. Be blessed.'

The mother-of-three said: 'I was just in utter shock. I got the card through the door and thought it might just be a belated birthday card. But when I opened it, I started to cry with happiness.

'I am just so grateful and cannot thank them enough. It's not all about the money, it's the gesture which made me feel so incredibly happy. It made my week.

'It's not every day something like that happens - I've never experienced anything like this before.'

Sarah - who is mother to Holly, 17, Ben, ten, and five-year-old Georgia - added: 'The choice to remain anonymous shows how kind-hearted and selfless the woman is. She didn't want any praise from it.'

Samantha Welch, pictured with son Rylan, was given £5 by a stranger who saw them on a train - inviting her to 'have a drink on me'

The man left this note to praise Samantha for how she handled her three-year-old boy - calling her a 'credit' to her generation

Sarah still does not know the identity of the mystery woman who was so generous.

She said: 'I literally have no idea who this anonymous person could be - I asked my friends but they told me they didn't send anything.'

It's not the first time a mother has been subject to a random act of kindness in recognition of her hard work.

Last year, a woman was given £5 on a train by a mystery man for keeping her son well-behaved.

Single mother Samantha Welch was moved to tears when a generous stranger – impressed by her parenting of her three-year-old son Rylan – gave her £5 with a letter praising her as a ‘credit to her generation’.

The mystery passenger had written his message on a scrap of paper folded around the cash, which he handed to her as he got off the train.

Kayleigh Moran was handed an envelope containing £200 in cash by an elderly stranger as she shopped with her 17-month-old daughter Daisy in Ashton, Greater Manchester

In 2014, a young mother was given an envelope by a man in the street which contained £200.

Kayleigh Moran was handed the letter by an elderly stranger while Christmas shopping and assumed it was probably a request for a charity donation.

Following the man's directions not to open it until he was out of sight, she waited until he disappeared among shoppers in Ashton in Greater Manchester.

But when she opened the envelope she discovered £200 in cash from a real-life secret Santa.

Kayleigh, who was shopping with her 17-month-old daughter Daisy, has no idea who the man was.