Joanne,
Do you mean the records of the civil registration of marriages?
If you do, the records of marriages that were originally registered with Tynemouth District Registration Office were, when Tynemouth Office closed, divided out to these modern Registration Districts, .... Northumberland Central (office in Morpeth), North Tyneside ( at North Shields) and Newcastle
( at Newcastle).
But the registers holding the details of all the marriages are NOT accessible.
At a Register Office, as you have already tried, you can buy a certificate, which is a certified copy of the original register.
But you certainly cannot search for anything as access to the registers is not allowed.
I would love to be able to stick my nose into the registers. I am thinking of all the £7s I would have saved. If you want info from the register, you have to buy a copy. Like in your case, they told you want the name WASN'T, but did not tell you what it WAS, although it was under their nose !
And in fact you were lucky, in that the RO did not take your money, because one of your specifications ( name of bride's father) was not fulfilled. Once the attitude of some ROs was to give you no clues, and leave it up to you whether you wanted to buy or not, without allowing any specifications, other than the names of the couple.
Maybe things are different in Gloucestershire ?
The marriage of William/Mary will be recorded in a church register somewhere, unlress they married in the Register Office !
When/where was William Leach born ?
Michael Dixon