Thanks for that, yes, I had seen that previously.
The money is the least of my worries.
It has taken months of negotiations to take time off work, to the extent I almost had to quit my job in order to get the time off.
I'm most worried about my flight being cancelled, or delayed so that I end up sleeping in an airport for 5 out of my precious 20 days leave. Not to mention the knock-on effect of missing scheduled internal transport within the holiday destination itself.