Access to kids

I have a court order in place, I have them every other weekend, from fri afternoon, to sun afternoon. It’s my weekend this weekend. It’s also my year to have my kids over Christmas, as my x wife had them last year. It was agreed I would have them from 7 Christmas Eve to 7 Christmas Day. With this, it pretty much gives me from the fri afternoon right through till x mas day. My x wife is now trying to stop me having them on my legal weekend, and that I can pick the kids up only on X mas eve night. If I refuse to give the kids back Christmas Eve, because I’ve legally got them over Xmas period as well... what can she do?

Busterdog, did you have a Family Law (divorce) solicitor you could consult by phone about this?