If you have a certain budget then fix it now if that rate suits your budget.
If you can afford to gamble a little than take an option which guarantees you a drop dead rate, but allows you to use the spot rate if its gone in your favour - there will/may be a fee for doing this.
If you can afford to take more of a gamble then just don't fix it and follow the spot rate.
As i don't need to furnish, aircon, light my place till at least April next year then I'm following the spot rate as i also still expect the £/€ to be back at 1.35 by middle of Q2 next year, however who knows what might happen next in world markets............ if Russia/USA keep being silly over South Assetia and the Russians decide to be sillier with gas/oil supplies to the west then this could throw the price of oil back up again which affects everything !
£/€ rate has remained between 1.24 and 1.29 now for the last 6 months so very stable, the $ is merely strengthening against all currencies which is then turned into the statement that £ is at an all time low............ which it is in the Trade Weighted Index (£ v a basket of major currencies)