Speaker John Bercow welcomed hundreds of teenagers to the House of Commons on Friday, as they gathered for a series of debates.
He said it was an "historic occasion", the first time any body of people other than MPs had debated in the Commons chamber.
The objections of a small group of MPs to the presence of the democratically elected youth parliament were forgotten as teenagers from all over the country debated university fees, youth crime, public transport, lowering the voting age, jobs and the economy in relation to young people with all the skill and force of argument of professional politicians.
Commons leader Harriet Harman welcomed and congratulated the MYPs, providing a mini-tour of the chamber.
She said: "There's only one rule - enjoy it and don't be nervous."
Funmi Abari from the London region was cheered for her barnstorming opening in the debate on scrapping university tuition fees in England and Wales.
She opposed the move and said it would not necessarily increase accessibility.
Referring to Scotland she said further education there is free, yet less accessible.
"There's no such thing as a free lunch," she said.
Jonny Gilchrist from the North West region called for a full and frank inquiry into how the university tuition system is run in the UK.
He argued that politicians were using the current economic climate as a "get out of jail free card".
The MYPs also debated lowering the voting age to 16, James Evans from the south east of England called for Westminster to "wake up" and allow the age to be lowered.
But Welsh delegate Jemma Karmaleeta Nye, said giving the vote to 16 year olds was "pointless".
She added: "We need education to go with it."
Earlier this year, a small group of Conservative MPs resisted having the chamber used in this way and suggested it would set a precedent for other groups.
However, their defeat allowed the "one-off" event to happen, following the Youth Parliament gathering in the House of Lords last year.
