What's an MTO?

[Tab Julius <tab@penworks.com>]

>From reading a mechanics book on MGB the other day there were numerous
references to an MTO, including many mentions of "could lead to an MTO
failure".

>From context, eventually, it seemed that an MTO is the UK equivalent to an
"inspection" in the US.  Yes?  In most states, vehicles need an inspection
sticker that they are "roadworthy".  Is this what an MTO is?  If so, what
does MTO stand for?  If not, what does it refer to?

Thanks

- Tab

'78 B
New Hampshire (currently 45 degrees and falling)