A swift look at the MoD website suggests their level of literacy seems to reflect the nation-wide reduction in standards of education.
Having become bored with “Recconnaissance”, I tried “Squadrons” there to find that MoD apparently believes the Tornado GR4 to be the only type to qualify as a Fast Jet: -
“a fast jet squadron (i.e Tornado GR4)”
The MoD web masters would do well to use a word processing application which includes a spell checker so as to avoid the more obvious errors. If they really don’t know their exemplia gratia from their id est perhaps they should confine their activities to the English language in an effort to reduce the incidence of solecisms.