Earlier quoted context omitted.
Sed quis custodiet ipsos custodes?
Ut semper, supercustodes.
I searched perseus for "ut semper" and found two results that might have relevance. The first was this:
> But the expression does not imply that he conceived them as 50 miles in perpendicular height, but that there is a continuous ascent of 50 miles to get to the summit. This explanation of the passage is adopted by Alexandre; Lemaire, ut supra.
Unfortunately, that is evidently English, not Latin.
The second was this:
> Quid quaeris? Est consul φιλόπατρις et, ut semper iudicavi, natura bonus.
(emphasis added)
Which I tentatively translate as "What are you asking? He is a filial consul and, as I have always judged, a good man by nature."
http://www.perseus.tufts.edu/hopper/morph?l=ut&la=la lists ut as having, among many, many other senses, the sense of "adverb of manner", which is the one at play in the above example and would also be the sense relevant to "ut semper". The dictionary entries give a large number of examples, but as far as I can see there are no examples in which the clause following ut does not contain a verb.