Train Toilet Told Me Door not locked Manchester Picadilly to London Euston Avanti Train June 2022

Train toilet talked to me! Onboard a train from Manchester Picadilly to London Euston. The train had a very nice and clean and huge toilet.
After you enter the toilet, you press a button to close the door. If you do not press the L button to lock it, it would tell you so! Very interesting.
Nice clean toilets. Awesome.
Enjoy the train ride!!

[@ArchiezAviation]

The train is a Class 390

[@guitarsingaporeRapture]

Great! Thanks for the info.