Since you have opted to make that big play, you'll need to discover a removal company that fits your needs the best. You do have a lot of choices.
Some removal firms are rather small. They might be a family affair with one truck. Others belong to a large network of known brand removal firms. You can also hire the best removal company in London or expert local movers like CBD Movers.
So how can you decide the ideal removal firm for you? It's easy. You initially have to determine if you're doing a long-distance move or a local move. If you're crossing state lines you might need to use a removal company that is certified as a long haul moving business. The smaller removal companies in London might not have the personnel nor the insurance or licenses to generate an out of state move.
These smaller businesses may do the real cost counting of moving your household goods but might have a contract with a very long haul firm to actually physically make the move. The local company may offer the employees to load the truck, however.
You need to take into account all these things. So you have chosen you're making a long-distance move. The next step would be to contact some regional removals companies in London and let them know you're moving from x to y and would they please come and provide you an estimate of what it will cost you to move your products.