Advice:
The UK High Altitude Association is a group of like minded people with a common interest in all things high altitude…. especially balloons. A great source of detailed information and FAQs http://ukhas.org.uk/
Also if you are actually considering having a go yourself then get onto the Irc high altitude channel, a dedicated chatting environment where I had many detailed questions answered instantaneously, I could definitely have saved time by visiting here sooner! http://webchat.freenode.net/?channels=highaltitude
Finally we would like to say a big thank you to the Chemical Engineering department at Queen’s University Belfast for all their support and helpful advice concerning the usage of Helium gas.
Suppliers:
Balloon, 35kg breaking strain nylon and parachute : http://randomsolutions.co.uk/top.htm
Very helpful and by far the cheapest supplier of weather balloons that I could find.
Radiometrix NTX2 Transmitter: http://uk.farnell.com/
Flight computer PCB and PicAxe 18X chips: http://81.134.141.187/epages/Store.storefront/?ObjectPath=/Shops/Store.TechSupplies/
Garmin GPS-35 : £15 Ebay