Thanks guys. I thought I would tell you lot, because it all comes down to being FAT.
I knew nothing about this. She eventually phoned to say that her ds1 didn't want to be friends with my ds1 anymore. my ds (who is weak as a robbin) had bullied her ds all week, on cub camp, he had ruined it for all the boys. She went on and on and on about all the terrible things he had done and how all his classmates felt the same way. I was sobbing and apologising.
I, in shock, questioned ( shouted at ds1 like i have never shouted at him before, and even shoock him by the shoulders, to my shame)
, and once gettign more of the story, phoned her back.
Her son, (who was incidentally, was infact fat and got teased, by a few boys, not mine, in reception, which I and all the other parents, told her was totally unacceptable) fell out with ds1, on the second day, when on the first night, my ds had jumped on them all, in his sleeping bag, and ended up hurting her ds. Hardly crime of the century. But her ds did infact end up with a big bruise.
The next day , her ds teased my ds and eventually said :
'well your dad's fat'.
Ds asked him to apologise, but he refused.
When I mentioned the your dad is fat comment, her son denied saying it.
Then she said " besides, he's only saying what he's seeing " 
You guys did see my photo, right? So you know that my dh is big.
Dh said " she thinks its o.k. for her son to call me fat. I don't".
This is no an easy situation, as I'm sure you will appreciate.
Dh is most upset and will not budge on this touchy subject.
I have lost my closest friends- we have been friends for 4 years, since reception, we live in the next street and regualrly pick up eachothers children if we get caught up, have to have smears etc.
Ds1 has been best friends with her ds for 2 years and is now not.
Ds2 is very good freinds with her ds2.
Now dh says that her ds2 can not come to our ds2 birthday party at end Oct, because he "can not have her there".
Not good.
Am daibetically hypo, and crying, as I type, forgive me. And am drinkign lucozade and have already eaten another 2 jacobs clubs,
sorry Poopoo. 
what a mess. Have sobbed about this many times, this summer.