European size mattress in UK

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We moved to the UK with our European bed. We now would like to buy new mattresses, but this is proving to be quite tricky! Our go to shop IKEA is not offering their European sizes in the UK (why???). Where else could we get 2 memory foam mattresses in a size 200x90 cm? Do we have to buy a new bed?

Amazon europe??? I don't know for sure but that would be my go to.

Foam Direct
You have to hunt through their website to find the mattress part

Don't know if you're still looking OP but I bought 2 mattresses from Ikea recently in the UK in exactly those sizes.

My IKEA did 2m beds when I got mine.