In London, as ever, there are some good Russians available. A lot of them operate out of the Agencies, but there are some good ones on AW with corresponding positive reviews on UKP.
But I agree, normally a bit liberal with the ages, but overall positive experiences from me with Russian girls so far.
. . .But once all the current crop's visas expire. . .they may not be allowed back in, so 'make hay whilst the sun shines' as they say!