I thought it was supposed to be fairly easy from the UK... $5K and a clean bill of health if i remember correctly....
At one time that was indeed the case, but since the British Isles became part of the European Community, although we Scots now have freedom to take up permanent residence in France, Germany, Spain, or any of the other EC countries, migration to the traditional "British Commonwealth" countries is nowadays much more difficult.
I've looked into the prospect of moving to Canada as almost all my relatives are already there. Canadian immigration has a points system with various criteria, including age where the points reduce to zero by the age of 55 to favour younger immigrants. As I understand the position, being over 55 there are only three possible immigration routes to Canada - 1) bring a specialist skill or trade which is in short supply in Canada; 2) be sponsored by a lone Canadian citizen who is a relative AND has no other close relatives living in Canada; or 3) find a Canadian bride.