Badeanzug Feel Maxfit marine/türkis ARENA

I ordered a size 10 UK from La Redoute but Arena swimsuit sizes are hard to work out. La Redoute have used the Arena swing ticket 'International size 38' as a UK size 10 however, Arena have stated 'UK size as 32'. A UK 32 is equivalent to a UK size 4. If Arena stated UK size 38 that would in fact be a UK size 10. - See photo of another swing ticket, same swimsuit, different colour from another retailer. It states International size 44 is equivalent to a UK size 10 therefore La Redoute sizes are THREE UK sizes too small!