OP, Amazon UK has latest generation iPods in stock and renewed classic iPod too. Grab a few to hold you over. They can last a long time. I've got one still going on year 14. Because they are not complex, they don't need software upgrades many times each year. As such, you might use the same OS for years and it won't mysteriously slow down after upgrades you won't be seeing.
Even buying just ONE iPod now should get you through maybe 5-7+ years after which you can decide on the phone option or maybe try iPad Mini- only a little bigger and it can be a great "big" iPod without all of the burdens of phone service costs. A good mini can last 5+ years before Apple obsoletes it with iOS upgrades.
Since costs are a concern, buy yourself a mini with cellular, get a voip app and it can double as a phone on cheap cellular data-only plans. Texting works the same as iPhone. I have to assume there are dirt-cheap data-only plans there, so that would be a way to get almost an iPhone, a great iPad with a built-in iPod all in ONE device with no burdensome cell plans, nor press to need to upgrade your "phone" every year or two. I clung to mini 2 until this year and expect the new 6 to still be my main iDevice for the next 5-7.