https://phys.org/news/2018-06-britain-eases-visa-eye-post-brexit.html

May introduced the cap in 2010 when she was interior minister but has faced growing demands from the healthcare sector to review it due to a shortage of staff that has left hundreds of NHS posts unfilled.

The annual limit of 20,700 on all non-EU skilled workers, broken down into monthly quotas, has been breached every month since December.