You only get the Premiership Parachute payments if you stay in the prem for longer than one season. If you go up and get relegated straight away, you'd only get that one season's telly rights and what not.
That's incorrect. You get the parachute payment as well even if you're up there for one season.
The Championship play-off final, used to be called the '£60m game' based one 1 season in the Prem, plus the 2 years of parachute money. It'll probably be called the £90-100m games now they've got more TV money, plus up to 4 years of Parachute money.