>share-options "valued at" £200K+ (but likely will barely get £50k when vested after 5 years of active tenure.)
This is a dangerous misconception to have. You may not want to work at FAANG which is fine. Otherwise don't shoot yourself in the foot by misunderstanding pay structure.
Public companies such as FB pay in liquid stock, that vests over some period of time. These are not options. You get 200K every year, immediately sellable. Or keep them and grow. Which given the performance over last two years would actually give you close to 400, not 50.