Beinn Talaidh - used to be a Corbett but was relegated to a Graham. https://en.m.wikipedia.org/wiki/Beinn_Talaidh Not only is it the biggest Graham, and therefore the best, it's as big as a Graham is allowed to be. There will never be a bigger Graham, and if there is, it's not a Graham, it's a Corbett. https://en.m.wikipedia.org/wiki/List_of_Graham_mountains https://en.m.wikipedia.org/wiki/List_of_Corbett_mountains Therefore I win and claim my £5 Ironically Ronnie Corbett is not a Corbett, he's a Hugh which is defined as anything smaller than a Graham.