limiter removal

[smnwllms]

how do I remove the limiter which is stopping my 55 plate transit going over 79 mph please?

[wesleymay]

Go to a Police Station and ask a Policeman
He might have just been to an accident involving someone like you who wants to break the law.
Maximum Speed - What is that?

[smnwllms]

Thanks for that wesleymay (tw4t), I suppose you've never gone over the speed limit!? Don't presume to know the way I drive!! The reason I want to remove it is, as the limiter limits the revs, it is a problem when overtaking lorrys, especially when climbing hills, so I need that extra push to get by.
Next time I want a stupid answer, I'll ask a stupid question!
If there is anyone out there that may be able help, please do.
Cheers