I also think I may contact the Consulate in Cebu again to confirm that if they don't know what the Isle of Man certificate looks like, how can I expect them to accept it.
I had a row with the Consul in Manila in 2006 because I had changed my name by Common Law about 20 years previously. That ,meant I had no document to prove it. My Passport was in my 'new name' and I had a previous passport, which had been cancelled, in my birth name. The Consul said he had never heard of a Common Law change of name and thus would pt accept the application.
I called the FCO and insisted that they tell the Consul in Manila to accept my application and get himself acquainted with the law. The person in FCO I dealt with (in 2006) was Natalie MONLOUIS.
A few days later the Consul accepted the application.
Maybe in this case Dave you could contact the FCO and get them to clear up any problem before you leave UK. After all the The Isle of Man is part of UK and thus an official document must be acknowledged just as one from any other part of UK would be. If the consulate in Cebu do not know what one looks likes then the FCO should be able to sort it out.
