In my experience, as someone who has taught internationally also, it can be difficult getting back into a British state school as many are suspicious of/sniffy about international school experience. Rather than seeing it as a strength that you've got experience of teaching cross-culturally, teaching bilingual and ESL/EAL students, and are internationally/globally minded with a head full of new and interesting teaching ideas learned from colleagues who have trained all over the world, some lack the imagination to see anything other than 'doesn't have recent National Curriculum experience.'
There is also a bit of a stigma, I find, with international teaching - some people seem to see it as something people who can't get a job in the UK do. Of course there are a lot of tinpot schools out in Asia and the ME that will hire anyone with a pulse, but the highly competitive world of international school teaching, with its amazing salaries and perks, is certainly no longer something for teachers with dodgy backgrounds as it may once have been. I was asked once 'what were you running away from, then?' - by someone interviewing me, which sums up the prejudice so many people have about international teaching! My response? 'A crap salary and work-life balance!'
To make yourself appealing to state schools, you need to make it clear that
a) you have excellent experience teaching students for whom English is not a first language - this is increasingly relevant in many parts of the UK
b) you are a Maths specialist! You are gold dust!
c) you are incredibly adaptable and flexible, having taught a variety of international curricula to a high standard, and will not find it difficult to pick the National Curriculum requirements back up
d) you have had the opportunity to learn from a variety of international pedagogies which has broadened, deepened and enlivened your practice
e) you bring a global mindset to the classroom, which is essential to building globally minded citizens
f) you are adventurous, innovative and creative - all essential elements of an inspiring teacher
If you do find it a struggle after applying for a few posts, you might find it easier to get back via an international or independent school in the UK. I also think being fixated on such a small area as Newquay - where there are very few schools to start off with - is probably a bit unrealistic. There is a national shortage of primary teachers, but somewhere like Cornwall is certainly not going to be struggling to recruit, so I would suggest widening your search area.
Good luck!