Heather Mills has revealed that she is "worn down" by her split with ex-Beatle Paul McCartney and has cancelled a number of charity engagements.

The former model was due at the launch of a vegetarian campaign against milk yesterday but pulled out, preferring to stay in Slovenia to rest.

Friend and colleague Juliet Gellatley said: "She is too ill. We heard from her today. She just doesn't feel very well.

"She had convinced herself she could do the launch this week, because she supports the aims of the campaign. But she feels so worn down."