Coinciding with the affair .... grin
It's accompanied by a nice puff piece about their marriage and how happy they are.
I think it’s all probably the other way around from what you’re thinking. Honours lists do not come out of the blue in the royal household and this date would have been in the diary for quite some time along with the wedding anniversary.
I’m pretty sure you’ve got this the wrong way around, I don’t think that the honour has been rushed out to distract from the affair story, if the two are linked it’s most probably the other way around and the affair story was deliberately leaked just before the wedding anniversary and the honour to deliberately take the shine off them. But I’ll say no more, don’t want to get the thread deleted.
*It's like the family order - they all get it eventually.
Camilla got it 7 years after the wedding, Sophie 10 years so 8 years is about right for Kate.
It isn’t the family order because that is a separate order for women, the Royal Family order of Queen Elizabeth II.
They don’t ‘always get around to getting them’. Diana had the QE2 order but never the Victorian one, Fergie was never given either. Princess Michael has never had either too, even though all the other Gloucester/Kent wives have.
It looks like the Queen gave nobody Royal (except Princess Anne) the GVO Dame Grand Cross until after her mother and sister died and that went to Sophie Wessex because she supported her through that time - Sophie actually got hers before Andrew and Edward. It is actually quite a big deal for a royal through marriage to get one as it rubberstamps that you’re regarded as a permanent firm member never expected or likely to leave.