Functional bikes. Not Porn not Anti

You can get a little spring thing to stop this, @spotter used to have one - look a bit shit banded round your DT but does the trick.

https://velo-orange.com/products/vo-wheel-stabilizer

I actually have a couple of these saved for a rainy day - give me a shout if you can't find them in stock online anywhere.

I could be tempted to part with one, they're super useful gadgets :)

https://hollandbikeshop.com/en-gb/bicycle-parts-city-bike/bicycle-fork-headset/steering-stabilizer/

edit refresh fail. Heldrig's link looks cheaper price.

There's also hebie stabilizers on SJS.