TfL still uses UTS in modified form and hugely reduced quantities, as detailed in Wikipedia. Decoding vital info centrally on the right hand side, machine series starting 01 upwards related to now-closed staffed Ticket Office windows; 10 onwards relate to self-service Fewfare machines; series 31 etc comprise a complex Multifare variant.
Heathrow Terminals 123 05 - UTS London Underground ticket - London Transport is best suited for travelers with a connection to Heathrow Airport who wish to explore London while purchasing a discounted ticket.
