Answering my own questions further here is the definitive web article on Enontekio airport.
http://www.finavia.fi/files/finavia/...f/enonteki.pdf
Extended to over 6,000 feet in the 1990s it apears.
Can seats on these flights ever be had cheaply at the last minute I wonder? I got a very cheap day trip to Iceland in November about 12 years ago.
Capvermell now seen heading off to tour operator websites to see if any cheapies are going to Enontekio tomorrow as he he lives only 10 miles away from Gatwick.