You saw four phrases, one at a time, and you had to work out the connection between the four phrases. Obviously, the more that you see, the easier it should have been.
The four phrases were
Grandmother in Caernarfon
Dislike within the sound of Bow Bells
You in Ancient Rome
Warning on a Golf Course
The Welsh for Grandmother in North Wales (hence Caernarfon) is Nain - pronounced Nine.
Cockneys are renowned for dropping aitches, and so Hate would become 'Ate - pronounced Eight.
The second person singular in Latin is Tu - pronounced Two.
And the warning on a golf course is Fore - pronounced Four.
And so all of these are Homophones of Numbers