Make sure you are using a proper 11mm brake pipe spanner on the hard line. Heat the metal section of the Flexi and it should come undone, I've yet to be defeated by one doing it this way. Just be careful as the rubber can get very hot and melt and then you have boiling brake fluid to contend with, I've not had this happen to myself yet but it is a risk.
The other thing you can do is cut the Flexi pipe off so it is just the union left, get a ratchet with the correct size socket (14 or 15mm I think) and the brake pipe spanner. Ram the spanner up against the body so it can't spin and then use the ratchet to undo it. It would be worth heating it before doing this but again be careful as when you cut the rubber hose there is a potential to get a booboo from the brake fluid.
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