Simon That bush looks to have started life as a standard steel backed composite bush, from which someone has removed the inner thin walled bearing material and pressed in a custom bush. Alas, while allowing reclaimation of the well worn crank, the oil holes appear to be not quite right, and as you have found, the bush is not pegged.
I'd go with the sound advice from Ironhead, bin the bush, start afresh and add some oil ways and oil drillings in the right place. Line boring the case to clean it up, install the bush then line bore again to the crank running clearance gives the best result. The outer end of the main journal is usually flush with the outer face of the bush, so bear this in mind if you decide to make a new one. The thread run out is the deal breaker here......maybe it is just too much hassle to turn the pig's ear into a thing of beauty.
Swarfy.
Swarfy.