Good afternoon, Cheapest was is ParcelForce Economy. This service is only available at a Post Office. This means the sender will probably have to queue and pay parking fees. The other drawback is you can't insure. Typical price for a solo frame double boxed sent economy uninsured is about £60.00. This would be in the 9.5 to 10.00 kilo weight bracket.
Oil up! Frank Ellingford London UK