500 years ago there weren't Baptists in England. Now there are. Does that mean the Baptists have "departed from the traditions of the faith"?
I think the Baptist denomination has departed from the Gospel, by their involvement with "Churches Together," merely keeping adult baptism as a tradition.
The Gospel Hall where we were meeting for 20 years was bought by a Grace Baptist group who wanted NONE of the membership to continue with them, though we assured them we would accept their leadership. They wanted the hall for a "church plant" with American support, so I presume it wouldn't be a "church plant" if we had continued with them ....
I believe that there have been Christians in England from the first century, preaching repentance & baptism in Jesus' name. They weren't Baptist denomination, but Christians.