ah - cheers for that. Through some googling I've been able to find some.
From sumitomo website:
https://www.dalroad.com/wp-content/uplo ... series.pdf
part number F(6098-0234)
pretty sure this is the same connector
http://www.cycleterminal.com/hd-250-connectors.html
no need for them now - but looks like you can get some from aliexpress etc:
https://www.aliexpress.com/item/32919693335.html
https://www.yqwakan.com/product_6002_1p ... 80234.html
Does just look like a normal spade connector - perhaps i'll retry just to satisfy my curiosity. All soldered and heat shrinked in now so no going back lol. Still, would be good for future accessories...
I'll have a search later for UK supplier or maybe do a small bulk purchase for the community benefit lol.