To work out costs over to you, its fair to say most of us would be using Royal Mail -
www.royalmail.com - which has an interactive price list. Compared to many other countries, our parcel postage is quite high.
I have a (knackered, so you can't have that!) ABS ECU in garage I think, so can weigh and measure size (might not be today, depends when I get back), so you can get a feel for cost of postage from UK.
I can't get to our postal offices easily or often, but if nobody else is prepared to, I'm happy to do it for you. My only reluctance comes from the fact the seller is a breaker, so won't know if ECU completely works or is intermittent (these DX ones start out being intermittent, which gets gradually worse), which means all the risk of it being faulty will fall on you
, and no comeback from seller on the international postage etc, or if I do it, it might be a couple of weeks before it gets posted, so might not be with you until a month after its purchased.