It is a Miltoniopsis hybrid. The label says "Milt. Chris Ellis x Monteray Bay", which is a fairly common crossing.
It wants semi-shade, humid, coolish conditions (12C-25C) and reasonable moisture. Pot in bark chips and water when the bark is dried out. It's not keen on being sprayed with water though.
If you tap it out of its pot and check the roots you should be able to see if they are healthy (white/silver and firm, with a noticeable growing tip of a different colour), or not (grey/white/brown and shivelled). If the roots are bad, repot the plant in bark and don't water for a few weeks. If the roots are actually decayed, they are better cut back just enough to anchor the plant in the pot.
If you take a look over at the UK Orchid Forum and run a search, there are some threads showing pictures of healthy roots for you to see.