Also never heard of Japanse Ash - but apparantly it IS Chinese Ash, according to this:
http://www.systbot.gu.se/staff/evaw...s/japonica.html
and this:
http://www.systbot.gu.se/staff/evaw.../chinensis.html
Anyway, as Jeff said it's outdoor, most things are in the UK. UK has a very temperate climate - somewhat similar to bits of Japan and China.
Outside, it needs to be somewhere bright - with several hours of direct sunlight per day (weather permitting).
Needs watering whenever the soil surface is dry to the touch - probably every day in good weather. You need to have someone look after it when you are away for more than one day or it WILL die. They do that, guaranteed.
Obviously depending where you are there is almost certainly a real Bonsai seller within an hour's drive. Worth a visit - you'll learn a lot from talking to the owner - he'll know all the local clubs, sell you some "tackle", bonsai feed, a pot or two and a few more little bonsai "starter" trees for a few quid.
Jerry
Amsterdam