You could use something like: http://www.kn-portal.com/locations/, but surely it might be worth looking at Fedex or something for a small one off shipment like this?
Yes, there's also duty and VAT on second hand goods being imported into UK - but even if there's no Duty/VAT the handling fees at this end can add up quite quickly
Most items I import leave the EU again not long after - in this case you can do a temporary import if the items are to be re-exported again, no Duty/VAT to pay this way.
You can also check for a suitable commodity code beforehand so you know how much duty you'll be paying - also not that the duty tariff that is shown for duty from specific countries applies to where the goods were !
You could use something like: http://www.kn-portal.com/locations/, but surely it might be worth looking at Fedex or something for a small one off shipment like this?

Sea freight itself would be cheap , no more than £150-200 for the shipping itself, but of course be a little slower than Fedex!
Only imported small stuff before and it's been £10-20 charge + tax. will have to look up the duty codes. Both manufactured and shipped from US and staying in UK.