I dont believe in the pre-formed pools I prefer to use my imagination to come up with a design that suits me and what I want to acheive.
May I suggest a depth of 4-5 feet if possible and because of the area you are in may I suggest a small heater to keep the temp in the winter at around 1-3c.
Is it going to be a sunken pool, or raised, formal or non-formal. This may sound condesending but its not ment to be. Im just trying to get you to think of exactly what you want, before you start digging up the Highlands. I have seen many of my friends suffer the concequences of not taking a little time to plan.
I only wanted one pool but having put it in I then scaped the area to encorporate another stand alone pool. Did that then decided to join them. All this was planned and it worked fine, as the photo's hopefully show. Even my kids are getting envolved in fish keeping. Good Eh...
The Greatest kingdom on earth lies but a few fathoms deep
Hey Martyn we can swop ideas as I am hoping to start my pond sometime soon "that is if my brother inlaw will still do it for me" he has done his own so knows the pitfalls etc but his first pond was pre-formed and he ended up removing it and making it bigger using a liner and now he has made a lovely bridge to go over it, so I will be trying to get it right from the start as I wouldn't fancy having to re-do it again and gerry I will be needing all the ideas I can get ok