A contestant in the audience of TV quiz show Who Wants To Be A Millionaire? was "fairly sure" a player and his friend were "in cahoots" to win the top prize, he has told a court.
Major Charles Ingram denies cheating his way to the £1m prize
Graham Whitehurst, a former player on the show, said a system of coughing seemed to be helping Major Charles Ingram towards the £1m jackpot.
By the time the final question was asked Mr Whitehurst was studying college lecturer Tecwen Whittock - accused of strategically coughing from the audience - to see what he would do, he said.
Earlier, a studio floor manager told London's Southwark crown court he had also noticed an apparent system of coughing during recording.
Mr Ingram and his wife Diana, both from Easterton in Devizes, Wiltshire, and Mr Whittock of Whitchurch, Cardiff, all deny conspiracy to "dishonestly procure the execution of a valuable security" in September 2001.
It was not frequent as in uncontrolled coughing, which is why I was suspicious
Millionaire? studio floor manager
On Tuesday Mr Whitehurst said Mr Whittock was "coughing really rather ostentatiously, throughout the programme".
By the time the £1m prize question was given he was fairly certain the major and Mr Whittock were "in cahoots", he said.
The question was: "A number one following by 100 zeros
is known by what name?"
He said: "I was listening out for Googol and thinking as soon as the
major says Googol what was Mr Whittock going to do.
The major's wife Diana also denies the charges
"So I was waiting. I was absolutely certain there was going to be a signal by
"[Mr Ingram] seemed to dismiss Googol initially and he went all round the houses as he
had done through the show, and as soon as he got to Googol Tecwen Whittock went
"There is always coughing during recording - but it is generally irregular and
not systematic," studio floor manager Philip Davies told the court.
And the coughing coming from Mr Whittock definitely fell into the latter
category, according to Mr Davies.
"It was not frequent as in uncontrolled coughing, which is why I was suspicious," he told the court.
Being hugely relieved - for this was a fantastic event, a change in lifestyle - that was not their expression
Supervising executive producer Rob Taylor
"There was no attempt to stifle it, which again was unusual."
Other crew members had been "similarly aware" of Mr Whittock's coughing, Mr Davies added.
Earlier, an executive producer of Celador, which makes the show for ITV1 in Elstree Studios in Hertfordshire, told the court he took the unusual step of searching the Ingrams after the show, because of the suspicious coughing.
But Rob Taylor nonetheless visited the couple in their dressing room with some champagne.
The atmosphere he found there was "not what you would expect" considering they had just become £1m richer, he said.
"It was tense between the two of them, difficult, it was very strange," he said.
Tecwen Whittock denies coughing systematically
"You had not got any bubbly enthusiasm... being hugely relieved - for this was a fantastic event, a change in lifestyle - that was not their expression."
The trial restarted on Friday after a juror fell ill.
Earlier on Tuesday, the court heard that the three defendants may have been trying to use mobile phones to communicate answers with each other.
The jury heard Mrs Ingram's brother, Marcus Powell, had twice been spotted listening to a phone during recording and had tried to get into the studios four hours before he was allowed.
Mr Ingram has launched civil proceedings to recover the £1m.
The trial continues.