I just found this on the H&M website. I 'think' you might have gotten bad advice actually. It seems to say that if you've 'ever' lived outside the EC for more than 12 months and 'ever' used these items for more than 6 months you aren't liable.
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5.1 Can I get relief from duty and tax on transfer of residence?
Yes. You can bring in your belongings or vehicle free of duty and tax so long as you:
are moving your normal home to the EC
have had your normal home outside the EC for a continuous period of at least 12 months
have possessed and used them for at least 6 months outside the EC before they are imported
did not get them under a duty/tax free scheme (but see paragraph 5.2)
declare them to us as explained in paragraph 3.2
will keep them for your personal use and
do not sell, lend, hire out or otherwise dispose of them in the EC within 12 months of importation, unless you notify us first and pay duty and VAT on disposal. Our hepline can tell you how to do this.
Belongings include clothing, furniture, portable tools of trade, pets and other household and personal effects, but not alcoholic drinks or tobacco products: you will not get relief on those unless they travel in with you and qualify for the duty-free allowances - see paragraph 2.1.
We will normally waive the second and third conditions if you could not meet them due to circumstances beyond your control. Explain the position to our officer when you declare your belongings or vehicle.
Generally speaking, "possession" means "to have" rather than "to own", but there are particular restrictions in relation to company vehicles imported by travelling sales representatives. Our helpline can give you full details.
See paragraph 5.5 if any of your belongings or vehicle were previously taken out of the EC.
Other goods and vehicles imported for commercial purposes will not qualify for this particular relief. However, if you are also transferring your business to the UK, you may be able to claim the alternative relief on imported capital goods. See our Notice 343 Importing capital goods free of duty and VAT.