OK I've not got there yet. Exciting isn't it.
sudo mkswap /swap.swap I got setting up swapspace version 1 size = 1048572KB no label, UUID =7b1a56be-a (ETC ETC)
In the end I got this:
dev/sda5 partition size 382972 used 27068 priority -1
Perhaps I should cut and paste? has Idone it twice?