I think that noone has the right to enter someone's house without notice unless it's an emergency (e.g. burst gas and water pipes). And that's it!!! What if, instead of Graham, they would have found a dog that would have attacked the intruders? Obviously it would have been the dog that would have been in trouble not the idiots who eneterd the flat without any notice.

Did they give you an explanation of why on earth they entered the flat without warning you even though you specifically asked to be alerted? Talk about privacy as well!

I'm sorry Graham had to go through this after all that he's been through recently! You have every right to be mad and upset, I hope you will be able to move to your own place soon.