Mae'r JCVI hefyd yn argymell:dylid cynnig brechlynnau o leiaf 3 mis ar ôl y dos brechlyn blaenorol, ond gellid hefyd cymhwyso arferion gweithredol hyblygpan fydd posibilrwydd o oedi sylweddol wrth roi'r brechlyn Covid-19 diweddaraf i gael ei gymeradwyo gan y DU erbyn mis Rhagfyr, dylai'r egwyddor o amseroldeb gael blaenoriaeth dros y dewis o frechlynpan fydd gwneud hynny’n hwylus yn weithredol, gellid rhoi’r brechlyn Covid-19 a’r brechlyn ffliw ar yr un pryd
In addition, the Committee advises:vaccines should be offered at least 3 months after the previous vaccine dose, although operational flexibility may be applied.where substantial delays might be incurred in deploying the latest UK approved Covid-19 vaccine by December, the principle of timeliness should take priority over the choice of vaccine.where operationally expedient, Covid-19 and influenza vaccines may be given concurrently.