Okay, so I had started from an assumption that heat was needed as everyone always says to use it when removing decals. I don’t possess a hairdryer but do own a heatgun but worried I might apply too much heat with it 😆
After Robgclarkson, Faustus and Nickhit3’s suggestions above though, I tried lifting the edge of the decals (Yari) with my fingernail and in a few minutes I’d got the main decal and square badge off the fork with nothing left behind and no damage. I’ll wipe down with IPA before fitting the new decals as a matter of course.
Just thought I’d post this back as it’s a job I’d been putting off as fiddly/time consuming which turned out to be an absolute breeze.