I recently had a boat transported from clacton to kent and used debbage yachting who are in ipswich. The main reason i used them they did not need a crane to unload my 31' boat and saving me about 200 pounds .
One further piece of advice, also from personal experience. If you can offer a haulier some flexibility on timing so that your order can be treated as a "backhaul" so eliminating empty running for his rig, you will get a worthwhile discount.
No doubt you also have it in mind to be absolutely sure your chosen haulier is familiar with this work - some rigs have strict size and weight limits - and that he has insurance! And only pay on safe receipt of the goods!
Andy, I used Owens of Llanelli, to bring my 30ft 5 .5 ton Westerly from Greenoch to Cardiff, the charge was £450.00 for a backhaul, I did have to use a crane to lift off, but they were good on time and very polite, friendly, insured and have quite a bit of experience. Tel me on 01443 208842 if you require details Clive.