UK employers: what kind of vacancies have you been struggling to fill?

We're keen to hear from employers in Britain which job openings they have been having trouble to recruit for, and why

Employers in the UK have cut back on hiring new staff, pushing the number of advertised vacancies down on the quarter by 43,000 to 908,000, while the unemployment rate rose unexpectedly to 3.9% in January from 3.8% in December, according to the Office for National Statistics.

We're interested to hear from UK employers whether there have been vacancies in their companies they have been struggling to hire qualified staff for, and why they think that has been the case.