Bleu Stean-Tannis (Image: South Wales Police)
Last Updated: 4 April 2026
A 40-year-old who had been released from a lengthy prison sentence for a violent attack has been sent back behind bars after police uncovered a cannabis growing operation spanning three bedrooms of his Swansea home.
Bleu Stean-Tannis, of Harries Street, Mount Pleasant, Swansea, was sentenced to 32 months in prison at Swansea Crown Court after pleading guilty to producing cannabis.
Previous conviction
The court heard Stean-Tannis had been handed a five-and-a-half-year prison sentence in 2021 for inflicting grievous bodily harm with intent. He and his cousin Michael Gilbert had carried out a joint attack on a man outside his home, repeatedly punching, kicking, and stamping on him. The victim was left with a collapsed lung, a smashed eye socket, and a ruptured eardrum.
Stean-Tannis was released on licence from that sentence in 2024.
The cannabis operation
Prosecutor Caitlin Brazel told the court that on October 12 last year, officers acted on intelligence and executed a search warrant at the defendant’s property in the Mount Pleasant area.
Inside, they discovered that three bedrooms had been converted for the cultivation of cannabis. Two of the rooms contained a total of 48 plants at different stages of growth along with lights and other equipment, while the third bedroom showed signs of an earlier harvest having taken place.
Police estimated the operation had the potential to yield up to 4kg of cannabis with a street value of up to £20,000.
Arrest and interview
When he was arrested, Stean-Tannis told officers he was “going to go guilty to everything” as he didn’t want to get “stitched up”. He then gave no comment responses to all questions put to him during interview.
Defence
Dan Griffiths, representing the defendant, told the court his client had ADHD and had found cannabis beneficial. He said Stean-Tannis had initially held a private prescription for the drug but turned to growing his own when the cost became “prohibitive”.
The advocate accepted, however, that “things became bigger than that” and the operation had progressed into a “modest commercial operation”.
Mr Griffiths said Stean-Tannis had responded well while on licence and pointed out that the decision had been taken not to recall him to prison following his arrest – which he said was an indication of his level of compliance.
Sentencing
The court heard the defendant had 21 previous convictions for 37 offences including robbery, using violence to enter premises, battery, breach of a restraining order, possession of bladed articles, and five offences of simple possession of cannabis.
Judge Paul Thomas KC told Stean-Tannis he would have known the consequences of reoffending while on licence but had chosen to ignore that and set up a commercial-scale cannabis growing operation. The judge noted, however, that the defendant had clearly “impressed” those responsible for his licence supervision as they had not recalled him.
With a one-third discount for his guilty plea, Stean-Tannis was sentenced to 32 months in prison. He will serve 40% of that sentence in custody before being released on licence to serve the remainder in the community.
