I used excessbaggage. I shipped 2 large 'tea' boxes (max weight 35kg each) with all the stuff I didn't store/give away etc, mainly clothes, shoes and documents (I hate to hoard in general as I move around so much).

I've now given away a lot of the stuff that I did bother shipping over as I clearly didn't need most of it otherwise it would have come in my suitcase.

I think total fee for sea shipping (the slowest way possible) door to door was something around GBP100. This was the cheapest quote I found.