Britain did not render advice or assistance to the Palestinians. They kicked the Palestinians to the curb and catered to the foreign Zionist colonial project."advice and assistance by a Mandatory until such time as they are able to stand alone"
Read your own links again and see were the arab muslims refuse to take part in any discussions or negotiations. So it wasnt the British holding them back, they cant force them to take part so now they have lost out because they were stupid