Thank you all for your answers! I read them last night and felt such a huge sense of relief and got the first good nights sleep since I started worrying about all of this.
Well I went to the ENT today. He took a biopsy as I expected but the look of horror on his face when I mentioned ear pain! He said well that actually is a concern and whenever we hear that we have took take it seriously. So he said come back in a week, if results are normal then he will have to do an investigation under anesthesia. If results come back pear shaped then off to Sydney for aggressive surgery. Hmmm I presume neck resection and or tongue if it's included. I think he is thinking as my pet wasn't clear there may be some residual disease. He then counted the number of months on his hand and said well it'd be about the right amount of time for it to show symptoms if it were residual disease. So where does this leave me lol is it reaccurence, same initial cancer which was very quite slow growing or a new primary if in tongue only.