My friend in UK claims to have gone to a church where the priest is a woman. Are females given official priesthood in any christian denomination?
No, not in "any Christian denomination" in the U.K. Only in some Christian denominations. For example:
Anglican Church (Church of England) who have female priests and bishops
Church of Scotland
The first woman to be ordained as a minister in the Church of Scotland was the Revd Catherine McConnachie by the Presbytery of Aberdeen in 1969. (Sources below)
https://en.wikipedia.org/wiki/Ordination_of_women_in_the_Church_of_Scotland https://en.wikipedia.org/wiki/Ordination_of_women_in_the_Anglican_Communion https://en.wikipedia.org/wiki/Ordination_of_women_in_the_Anglican_Communion#Scottish_Episcopal_Church
However, there are many U.K. Christian denominations who do not ordain women to the priesthood, or even to any role where they have authority over men.