Never done this crossword so rather struggling!
12a. The practical details of a mechanic's requirements (4,3,5).
?U?? ??? ??L?? I am perplexed as to what it could be....
Last one which I cannot get.
1a. Remnant, keepsake close to heart (6). R?L?C?
I thought it may have something to do with relic but cannot think what last letter is....