I have had some bad experiences with Shiply. I have therefore not used them for some years and the information below may now be out of date.
Shiply is a broker not a courier, so when you book through them the first payment you make which looks like a deposit is actually their commission (which is included within the offered price). At this point, you are on your own, so if the courier changes their mind about delivering it can be extremely difficult to get your money back. If the courier damages something you have no contract with Shiply, only with the courier, so if they don't give you the details it can be impossible to get redress for losses, damage etc.
I went over to dealing directly with couriers such as DHL, Palletline National Pallets etc. which generally seem to be quite happy to take a single shipment.
Good point made above about size - weight is not likely to be an issue. As an idea, National Pallets will do a quarter pallet that is big enough to take an engine for £52 if it's not urgent.
Alec