Up to Senior Bronze (which is European here) the norm and standard is one pattern around the ice. If the judge chooses, as s/he wants to check something, then, they are sent around for up to an additional lap. You only get the double laps with the Junior Silver on up, i.e. Keats, Harris, American and onwards.
My DD is an evaluator; her call on this is that, at the lower levels, the lower level of complexity in the dances is such that an evaluator can clearly see what needs to be seen in a single lap; they give them that second lap to help them correct something that might have been a momentary glitch.
We can also solo from Senior Bronze on up if the evaluator requests (although adults have a different rule).