A Kenyan, Victor Okumu, was handed a 15-and-a-half year sentence for stealing jewellery worth £441,640 (Sh55,357,365) from Northallerton jewellers in North Yorkshire UK.
Okumu is said to have stormed the jewellery store wearing a crash helmet, boiler suit and dived over the counter.
It is reported that he used an object to force the store's door open, then pushed a cardboard type box into a staff member before jumping over the counter.
The judge stated that Okumu's robbery was a 'planned, sophisticated, commercial robbery' that he had planned for months.
Police noted that they had not found half of the jewellery alleged to have been stolen from the store.
Reports by YorkExpress, a publication in the UK, wrote that Okumu had committed a similar offence over a decade ago and the appeal court judges had recommended that he be deported at the end of the 13-year jail term.
However, after he was released on March 20, 2014, he chose to remain in the country.
During the time, Okumu had robbed a woman in her own home at gunpoint.
