Thanks! The ultimate fix is to finish upgrading the aging grid. There are other things that can improve the situation however, such as building wind farms away from these constraints, storage (but these can sometimes exacerbate constraints), demand flexibility (eg. place demand above constraints), zonal/regional pricing, and probably more I can't remember off the top of my head.
The demand flexibility aspect is already being explored: https://www.gov.uk/government/news/government-to-make-plug-i...