Vinlander,
"It is a lottery, and given a choice between adding apricot genes (delicious) or asian plum genes (bland) I would have preferred more 'cot."
What you need is an Aprium. While I have not heard of these trees being on sale in the UK, they are also known as “interspecific” hybrids, being crosses between related but different types of fruit. An aprium is a hybrid being 75% apricot and 25% plum. Apparently, it looks and tastes like an apricot with a touch of plum flavour, and was developed Floyd Zaiger in California.
Strange though it may seem, a whole series of crosses between plums and apricots, and even peaches, have now been developed. The original hybrid is the “plumcot”, which is ½ plum and ½ apricot. This hybrid was then used to create further crosses in the late 20th century by Floyd Zaiger in the US. One such complex cross now available in the UK, is the “Pluot” whose parentage is ¾ plum and ¼ apricot.