I would definitely agree with Rentoul that this was a snub rather than the weak palace response that they had to draw a line somewhere and that this was a private wedding rather a state wedding where ex Prime Ministers would have been invited. I don't think the most ardent monarchist would say that Kate and William's wedding was a private affair.
The Palace spokesperson then goes on to say that only Knights of the Garter and Knights of the Thistle were invited and of the Knights and Ladies of the Garter are non other than Baroness Thatcher and Sir John Major but no Blair or Brown despite there being two vacancies in the Order of the Garter. The Order of the Thistle on the other hand is specifically for the Scottish great and the good. Incidentally and please note, there is no Order of the Daffodil or the Leek but there is ONE Welsh Politician who is a Knight of the Garter, Lord Morris of Aberafon which just goes to show that the Palace still look upon Wales as an appendage of England.
Knights, Companions and Ladies of the Garter are not selected as political patronage but rather by the Sovereign personally, with or without reference to the Government. This would indicate that the absence of Brown and Blair at the wedding and in the Order of the Garter was probably a snub by the Sovereign herself which brings into question the political impartiality of the British Monarchy and as John Rentoul himself said,
"Who, then, should take responsibility...that the Royal Family corporately, led by the Queen, "held no torch" for him, seems the most likely reason. They are not exactly Labour – a lack of sympathy that may well be shared by the Middleton family."