Bulls skipper Jamie Peacock admits to having sleepless nights as he

wrestled with his decision to quit the club he joined as a raw-boned 18-year-old for arch-rivals Leeds Rhinos.

The club will today announce that the 27-year-old future Great Britain captain has turned down a contract extension - ahead of an expected announcement from Rhinos when the anti-tampering period expires tomorrow.

"I've been thinking about it a lot over the last couple of weeks and it is a sad day for me," said Peacock.

"I've got a lot of good memories here and I've had a lot of good times. I've met some great people and really enjoyed myself.

"It was a very tough decision. I spent quite a few nights thinking it over."

The challenge of starting fresh at a new club rather than any financial incentive was the main reason Peacock decided to turn his back on the club with whom he won two Super League titles, two Challenge Cups and two World Club Challenges.

"It was nothing to do with money," said the 2003 Man of Steel.

"I could have gone other places if it was about money. It is about a new challenge and it is definitely a big challenge to move to your local rivals.

"I've been at Bradford a long time and enjoyed it but I felt that some things

needed to change. I needed a change of scene myself. I'm one of those people who doesn't like to stay still for too long."

Privately Peacock must be concerned at the reaction his switch will provoke from Bulls fans but he insists he has made the right decision.

"Whatever decision you make you have got to make the right one," he said.

"The decision to stay at Bradford could have been the easy option but the hard one for me was to go to Leeds. That is the one I'm going to take and I'll make it the right decision."

Before he goes, Peacock is eyeing one last trip to Old Trafford with the Bulls.

"The reason I have been at Bradford so long is that they have been so good to me and I have had such a good time while I've been here," he said.

"I've played in a lot of big games and a lot of finals and the great thing at the moment is that the club is on a bit of a roll.

"They have got the bad news out of the way, with certain people leaving and everything. Maybe two or three months away it wasn't like that.

"And we have got key players back fit and playing. It is a good team to be playing in at the minute.

"I want to get to that Grand Final and win it and we are getting ourselves in the position where we could do that. Looking back two or three months ago, that wasn't going to happen."

The Bulls are also set to announce the departure of loose forward Lee Radford, who has been strongly linked with home-town club Hull FC.