I did actually wonder about this, especially for spare parts which always come from Germany rather than the UK.
Was it spare parts or sets? I'd (hope) that full sets would be dispatched from the UK, and so the tax was sorted out already, but I can see that wouldn't be possible for the spare parts service - and potentially I can either see them refusing to post to the UK.
I *think* you used to be able to receive packages up to £50 from outside the EU but I know it's a bit hit and miss - I've had clothing items from Australia be hit with the import charges, and some vinyl from the USA and both would have been below the £135 threshold. It's easy to forget when you're buying online
