Experimental studies indicate clinical protection and reduction in virus shedding occurs quickly. The longer the period that elapses between vaccination and disease challenge, the higher the protection. It is true that we should assume that between 7 and 14 days post immunisation in cattle needs to elapse before we can assume a high proportion of animals will have sufficient immunity that little virus will be transmitted by them after disease challenge. But we know that in both pigs and cattle immunisation dramatically reduces the titre and duration of virus excretion. Of course, vaccination by itself is not the total answer.
Appropriate slaughter is essential, as are movement controls and traceability.
But quoting Saudi Arabia is a quote too far. British conditions are different from Saudi Arabia, where there are some huge, irrigated cattle farms with up to 15,000 animals per unit, in close contact. The situation is really an extreme case of animal husbandry and under such conditions of close contact, vaccination is often not sufficient by itself if eradication is the aim. A wide variety of vaccines have been used, and some have dubious standards of quality assurance and come from a range of countries and require to protect against a range of virus types. We are NOT proposing living with the disease, and we are dealing with one virus type.