The Harry Potter author says she has already conjured up the conclusion to her series of books about the teenage wizard.

JK Rowling sketched out the plots for the planned seven books long ago but says that she has actually written the final chapter of the final book.

A television profile of the Scottish author is to be screened on BBC1 on December 28.

She says there could be a further Potter book when the series ends - to raise cash for charity.

She said: "I'm not going to say I'll never write anything to do with the world of Hogwarts ever again. Because I have often thought that (if I wrote) book eight, I think it would be right and proper that it should be a book whose royalties go to charity entirely.

"It could be the encyclopaedia of the world (of Hogwarts) and then I could rid myself of every last lurking details, but no not a novel."

In the programme she allows the cameras to see the final chapter, saying: "This is it and I'm not opening it for obvious reasons - this is really I'll wrap everything, it's the epilogue and I basically say what happens to everyone after they leave school, those who survive - because there are deaths, more deaths coming."

She even hints that one of the long-standing characters will be wiped out in the forthcoming three books.

There will also be further romance following on from Harry Potter and the Goblet Of Fire in which he has a date with a quidditch team-mate - and develops more of an interest in pal Hermione.

Rowling said there will be "more boy-girl stuff, inevitably", adding: "They're 15 now, hormones working overtime. And Harry has to ask some questions that I hope the reader will think 'well why hasn't he asked this before'?"

Story filed: 00:31 Monday 24th December 2001