Jeremy Bamber was reportedly inundated with cards from fans as he spent his 59th birthday behind bars.

The White House Farm killer was jailed for life with no possibility of parole for the shootings of five members of his family at White House Farm in August 1985.

Bamber, who has maintained his innocence over the last 35 years, received a huge bundle of letters from supporters, with others sending cash to his prison bank account, according to The Sun.

Bamber is currently locked up at high security Wakefield prison in West Yorkshire.

A website dedicated to protesting his innocence told supporters this month: “Owing to the volume of mail sent to Jeremy each day it can take a while for you to receive a response so please allow 6 weeks before writing again or contacting us."

Jeremy has accused ITV of 'cashing in'
Bamber was found guilty of slaughtering his parents Nevill and June, his adopted schizophrenic sister Shelia and her six-year-old twins Nicholas and Daniel in a mass shooting

They then instructed: "If you write to Jeremy and would like a reply to your letter please enclose an SAE or send stamps, which helps Jeremy to keep in touch with the outside. You can include more than one SAE in each letter if you wish."

The message went on: "All mail is censored by the prison so please do not send letters longer than two sides of A4 paper (a cheery greetings card will suffice). You must include your name and address or Jeremy will not be able to receive your correspondence/stamps.”

Jeremy Bamber murdered his family in 1985
Jeremy Bamber has desperately tried to appeal the White House Farm murders
Bambi Caffell with twin sons Nicholas and Daniel
Sheila Caffell, pictured with her two sons, was initially believed to be behind the shootings

Supporters were also told: "You can send photographs, drawings, paintings, cards, print outs from the internet or extracts from books, magazines or news articles, writing pads and envelopes but no other stationery including writing pads bound with wire.

"Do not send cards with organic or other material stuck on them, glitter, sticky pads or concealed sections.

“You cannot send cards with any concealed panels, bits stuck on including card, paper, jewels, fabric, organic material.”

Jeremy Bamber and his then girlfriend Julie Mugford at the funeral of three of the relatives that he murdered
Jeremy Bamber and his then girlfriend Julie Mugford at the funeral of three of the relatives that he murdered
Actors Freddie Fox and Alexa Davies recreate the scenes in ITV drama White House Farm

Bamber was convicted of shooting dead his mother and father, sister Sheila and her twin sons in 1986.

The prosecution persuaded the jury that Bamber had placed the murder weapon in his Sheila's hand to make the crime scene look like a murder-suicide.

Police at the time  initially believed the theory about ex model Sheila, who had been diagnosed with schizophrenia.

The notorious murders have been revisited in new ITV drama White House Farm, with actor Freddie Fox playing Bamber.

The series continues tonight on ITV at 9pm