Please help a newbie out!

[Optimist]

Everyone has already given good advice about potting. Let those roots have more air! Your mantra needs to be water and then let dry, water and then let dry!

I live in a state here in the U.S., where central heating is not very well known. We have little heaters in the rooms we sleep in. The average low in winter is 43.8F, which in Celsius is 6.55. This is very similar to England as a whole. The heat in the house with the heaters going runs in the 60's-to 70's, or so. My orchids have never had a problem with it. You do need to water them less in the winter.