Cheapest courier

CZ,

Actually USPS will be the cheapest, if you ship directly with an Airline, which will be exceedingly difficult if your not a "known shipper". Since this is an international shipment OP will have to clear customs for the speakers once they reach the UK with all the fees, bonds and paper work that involves. Then there is local transport from the airport to consignee etc. For a one of shipment USPS /FedEx/UPS/DHL certainly would be the preferred choice, since all the above is included in their price.

Best of Luck

Peter

Thanks Peter.

Yes further inquiries reveal that the airline only accepts packages from a company who have an account with them & you have to drop the parcel at the airport. 
I'll be using the link I posted above. 

I appreciate your input guys.

Thats Great Discussion . thanks guys 

Thanks to all 

best regards

vrlcore