The contact I signed complies with UK law, which entitles me to 5.6 weeks (=28 days) per year.
If I worked in the office, on a "5/2" shift pattern, I would be able to take 10 days holiday and achieve 16 days free of work. However, no shift pattern was stipulated in my contract- instead there is a loosely worded job description which advocates a 6/4 shift pattern. So I should be able to take 6 days holiday and achieve 4+6+4 = 14 days off.
Can I do this? Can I

. The company recently published a matrix of holiday allowances for aircrew staff. This says that 14 days off will "cost" me 9 days from my annual allowance.