My mate Aaron at Cult Classic Tattoo does amazing japanese work, he's studied with the Japanese dudes and really knows his stuff. I'm sure I heard him talking about trad Japanese work on black skin last time I was there - you could do much worse than giving the guy a call.
Cult Classic doesn't have appalling waiting times either, plus he guests at Frith St (though I'd recommend taking the 20 minute train journey out to Cult Classic if you can - much more relaxed environment).
+1
I've heard good reports about this place and I met Aaron a while back at FST, been meaning to pop over to Romford and have a look
+1
I've heard good reports about this place and I met Aaron a while back at FST, been meaning to pop over to Romford and have a look