Upvote:1
When I was applying for UK visa via TLScontact center in Ireland (Dublin) in 2017, I brought the checklist with me, however, it was not taken by the officer.
TLScontact printed their own checklist though, which I had to sign. And then I was required to bring this checklist with me when the passport was ready for collection. This TLScontact checklist is mentioned in their FAQ: How can I collect my passport? as well.