No, I had made it abundantly clear that they weren't to bring gifts. The three parents who insisted on bringing gifts made it clear that they had deliberately chosen to ignore our request.
Frankly, our DS doesn't need any more toys. I have (at risk of outing myself) 8 siblings, 27 uncles and aunts, and over 50 cousins, quite a few of whom visit regularly and have brought gifts for DS over the years. This does not include DH's family either. We as his parents are also generous with him throughout the year. Bar continuously moving house or numerous trips to the local charity shops, we physically could not contain gifts from everyone even if we wanted to 
Those three parents knew this but decided to override our wishes irregardless. I accepted the gifts graciously, and made the decision to not invite them this year - their presumptuousness was the height of bad manners, even if they tried to mask it as generosity. As it turned out, they were toys DS already had, one of which we (i.e. DS and I) had donated to our local charity shop a few weeks before because he felt he had outgrown it.
We are having a class party for DS this year. His choice and ours. That means 29 individual children. Add family and other children we know who don't go to his school, that means potentially 50 children. Does anyone think 50 individual presents is a good idea? Or shall we uninvite classmates who may not get the chance to attend other birthday parties of their classmates (yes, we have been to enough birthday parties to know that the same children are not invited/left out again and again)? Yes, children need to learn that they can't be invited to everything, but I see no need to perpetuate that just yet (there will be ample opportunity for small intimate parties over the next decade plus).
Still perplexed at the insistence of people on this thread that presents should always be brought. There are few parents churlish enough to deny their kids any presents whatsoever (and the OP is clearly not one of those parents, as she has said she treats her DDs throughout the year and/or when they need things). Like I said previously, if you are fortunate enough to provide your children with ample things (toys or otherwise), why simply accumulate more toys from others for the sake of it?
I understand generosity - wastefulness, I don't.