Really struggling this week.
13a Being red in 16, it's surrounded by 25 (4) ?U?L
17a Give guys diamonds, for example? (10) ?L?O?R?P?S Perhaps GUYS refer to ROPES?)
28a Guy regularly booing band (6) R?B???
16d Double yellow lines throw ordinary F1 team (4,5) T?R? R?S??
Thanks people. All obvious now but not being a motor racing fan had never heard of TORO ROSSO. In fact it took me a little while to figure out the rationale behind the clue but eventually got there. And the reference to 25 still eludes me. Surprised there's no clue referring to Mr Fawkes this week as that would have given a third meaning of GUY!