I believe there are no such aircraft in UK. Fire-suppression aircraft are flown in the USA, Canada and a few other countries, but they are not common in Europe. You would do best to direct your query to te North America forum.
Please note that you will need the right to live and work in the country you aim to fly in. That is a simple affair in some countries, but not in others - such as the USA and EU. Look carefully at the regulations before you set your hopes on a particular country.
Scroggs