Bristan Monobloc Tap - Size of hole required?

[Steve54]

I have bought a Bristan Renaissance Monobloc tap for use with a Belfast sink and a granite worktop. The granite is being cut offsite, and the makers want to know the diameter of the hole required for the tap. Bristan have so far given me three different answers!!!

Anyone got direct experience who can tell me the right size hole I need?

Thanks for any advice.

 

[Softus]

Suggestion 1: get the worktop makers to talk to Bristan.
Suggestion 2: buy the tap and send it to the worktop makers.

 

[Gasman1015]

35mm is the norm for majority of kitchen monobloc taps.

 

[Steve54]

I'd considered both suggestions, but thanks anyway.
Thanks Gasman - 35mm is one of the answers that Bristan gave me, so I think that's th eone. (The others were 28mm and 15mm!!!!)