The flap has been wired up .Looks a bit horrible like that . but its perfectly ok leave it like that l .Would suggest you trawl through the forum . these mods. have all been discussed before.
These Mods do work very well indeed Oh by the way thats the throttle butterfly that wired up , the links get worn and then it falls off stops the car revving up Diesels dont need a throttle they use the pump to regulate engine speed .

If i am not mistaken the test is for Black smoke and this mod doesn't effect it . If we get into a debate on this My friend Howard is an MOT tester at a Ford garage I will ask him,his veiws on this and what the ministry say !
the other thing is put the links back on and take out butterfly . my son did a far neater job of fastening it up on his 2.5