Before BREXshit, customs seemed to ignore stuff from JP, which saved a few £££ Prices were keen, but I found descriptions were sometimes overly positive. I also found used stuff never came with original packaging - small homes I guess.
The only thing that’s changed since BREXshit is the fact that fewer JP sellers will deal with you because of the paperwork, and you will always pay the full suite of taxes. Fair enough, but there are no bargains consequently. 110V of course.
I’ve bought a fair few bits from Japan and I tend to find if buying from Yahoo Auctions via FromJapan or similar that you tend to get consistently walloped with tax; whereas from ebay sellers from Japan it can be a lottery and sometimes you will and sometimes you’ll get lucky.