Here are some of the rules re kit for Time trialling
No competitor may carry advertising or the name of a commercial business on his race clothing except:
a) where he is a member of a club or team that has paid the advertising fee, he may carry advertising, but must not compete in clothing of a trade team that is/has been registered with the UCI unless he is a member of that team: or b) when competing in club events N.B. The inclusion of a manufacturer's logo shall be permitted.
You will be fine in club kit, or something plain