As someone who is in their early 30s and with a friendship group accordingly only three of us have been double-jabbed (one of who was a key worker so got his in January), the others have not been able to get theirs before minimum the end of this month.
Have you tried a walk in centre ? List and dates here, give one a go this week and let us know how you get on
https://www.sussexhealthandcare.uk/keepsussexsafe/sussex-covid-19-vaccination-programme/