Fiddler,
I couldn't disappoint you.
Chop Gate is pronounced exactly as written, by the locals who live there .
Chop Yat is used by all the Townies M'boro, Stockton etc.
Some sort of perverse folk lore has grown up whereby all the Townies believe the locals pronounce it Chop Yat .
Go and have a pint at Chop Gate - and pronounce it Chop Yat and the locals will have a great laugh at your expense.

Terry K , in his mention of Marton-in-Cleveland omitted to mention that , this is also the birthplace of Capt James Cook - the worlds greatest cartographer and seafarer / explorer ( and for our U.S. friends who may find this thread a bit puzzling) the man who started the Americans calling the Brits - Limeys , as 'twas he, who accidently discovered, that eating limes eradicated scurvy in his crew members.

Cheers Betsy