As an owner of 2 Reilly bikes I was quite surprised to hear this, so I did a bit of digging and it’s true.
Reilly Cycleworks have been liquidated: REILLY CYCLE WORKS LIMITED overview - Find and update company information - GOV.UK
What’s stranger is that I still get emails from them, and now they are Reilly The Titanium Bike Co: https://reillytitanium.com/
I hope the lifetime warranty has been preserved: Warranty Information – Reilly The Titanium Bike Co