Steven is from Buckingham and has links to Aylesbury, Milton Keynes, Oxford and Northamptonshire.
If you have any information about Steven’s whereabouts lease call the 24-hours Thames Valley Police enquiry centre on 101 quoting occurrence number 43140092907.
Thames Valley Police is continuing to appeal for assistance from the public to trace a teenager missing from Buckingham.
Steven Tiffin, aged 14, was last seen at an address in Century Avenue, Oldbrook, Milton Keynes, at 12.30am on Sunday 15th June.
Enquiries to date indicate that Steven caught a train from Milton Keynes railway station to London Euston on the morning of Sunday.
However he may have returned to Milton Keynes since then.
Steven is white, 5ft 10ins, of slim build with short mousey brown hair.
He was last seen by a relative wearing jeans and a grey hooded top and is thought to be carrying an army style backpack.
Steven may be using the name Steven Nash.
Mrs Bercow, an outspoken Labour supporter, was invited to attend the service as the wife of her husband, John, who will be going.
But in a statement today, she said that she was not obliged to accompany him in the performance of his public duties.
She also accused No 10 of leaking details of her decision not to go to the press in order to try to undermine her husband.
"As Commons Speaker, John will be attending the funeral - and rightly so. But I'm not obliged to participate in my husband's public life - last time I looked, this was the 21st century! John holds public office and an important position, not me," she said.