A little while ago, we had a jolly period in which within a few days we celebrated S Edmund of Canterbury and S Hugh of Lincoln and S Edmund the Martyr King. For the Divine Office on such occasions, I use a nice old 1874 Breviarium Romanum which has at the back of it Officia propria Sanctorum Angliae. (This supplement clearly goes back to before the decree authorising a distinct Calendar and propers for each of the Flaminian Gate dioceses.)
In my old Breviary, before each of the collects we are told where it comes from: again and again, Ex Missali Sarisburiensi. The Roman liturgical authorities had no desire to sit down at a lordly table and compose new collects for our English Saints. The dear old Sarum Rite was good enough a source to satisfy this need. And those collects continued in use until the period after the Council.
I haven't done a precise survey of this, but I have a distinct impression that the Diocesan Propers for the Novus Ordo largely dispense with those silly old medieval collects. Bright new Woolworths collects take their places. Commonly, they have that verbose floridity and appetite to be clever which are such marks of modern English middle-class drafting. Moreover, I have been told that there still do not exist official Latin versions of the new collects. In other words, the English Hierarchy and the Roman liturgical authorities apparently expect the English clergy regularly to disobey Sacrosanctum Concilium paragraph 101 (1), which directs that the clergy are to recite their Office in Latin unless they have permission from their bishop to do otherwise ... and that permission can only be given "singulis pro casibus" ... on a one by one basis ... not as a general permission.
(To be fair, I should add that the Welsh dioceses do make full provision for observing the Welsh Saints in the Novus Ordo Divine Office in Latin ... we should congratulate the Welsh on being trilingual!)
Incidentally ... 'Jacobites' might be interested to note that in my 1874 Breviary, S George is referred to as "Patronus Regni". S George is patently the Patron of England but not of Scotland, and so he is in no way the Patron of "the United Kingdom". Thus, describing him as "Patronus Regni" implies the position which was maintained by James III, Charles III, and Henry IX, that the "Acts of Union" of 1707 and 1801, passed as they were by an intruded and merely de facto regime without the authority of the de jure Sovereign, did not truly extinguish the three Kingdoms of England, Scotland, and Ireland.