RE: Gov document22 May 2021 23:09
"'5. Additional potential solutions are to invest in developing new vaccination strategies that
could induce stronger T cell responses since T cell epitopes might vary less over time."
It certainly seems like an immunobody vaccine fits the bill.
https://www.scancell.co.uk/immunobody
"The most important aspect of the ImmunoBody® technology is the ability to initiate both direct and cross-presentation of epitopes to T cells. There are various pathways by which dendritic cells can process antigen, but the highest avidity T cell responses (i.e., the most potent) are generated if more than one pathway is used to present the same epitope. In the case of ImmunoBody®, the DNA form is taken up and processed directly by dendritic cells whereas the protein form (which is produced from the DNA in cells at the site of the injection) binds to the high affinity Fc receptor on dendritic cells leading to cross-presentation. As a result of both the direct and cross-presentation, the T cells not only have a higher avidity (up to 100-fold increased potency), but there are many more T cells generated against the epitopes of interest."