1 1/8'' Ahead stem for 1'' steerer tube.

[Tsundere]

I put this on yesterday.....

https://www.retrobike.co.uk/threads/boa-profile-1-steerer-ahead-stem.482289/

Cheers, I have the right stem, just looking for an unusual adapter to allow me to fit in a way that won't look naff.

You could use a quill raiser.
https://www.sjscycles.co.uk/stems/oxford-quill-stem-raiser-1-inch-222-mm-x-100-mm/The upper section is (usually) the right size to clamp a 1&1/8 ahead on, and the wedge bolt is well recessed, so once fitted you could cut the upper tube to the right length and then fit a star nut.

Thanks for this, definitely worth a look.