“Then the CCTV from the store that Michelle bought some groceries from captured Vyas coming into the store.
“That was put on an appeal poster that was sent to around 60,000 addresses. We then received a call from a gentleman who said: ‘I know that person, he used to work for me. He’s now gone back to India, but his brother still works here. He’s drank from a bottle of water, I’ve kept that bottle’, is effectively what happened.
“DNA was taken from that water bottle and it was shown that the person who committed the offences was a male sibling of the person who drank from that bottle, which then led to Aman Vyas being identified.
“That is a really unusual investigative technique, I’ve never come across that before. My colleagues have never come across anything like that before.
“The scale of this investigation is enormous, one of the largest that we have had within our command.”