It's not cheap, better off using someone good than cheap though. I've never had any issues with paisley freight. Don't know what the cost is currently.
https://www.senditnow.com/parcel-delivery/uk
Actually a subsidiary of parcel force (for good or bad) and all delivery handled by parcel force. Used them a couple of times for bikes and worked okay for me.
Even managed to get a full (£45) refund once when customs rejected as too dense an electric motor being sent to Sweden (hard to find customer services contact details but there somewhere!).