I was on the lookout for deal on a Sony A1. I spent about a week going back and forth before going with nextdaydeal. To be honest they're the only company that gave me reassurance and were a UK based company unlike the others and didn't get annoyed at my price haggling. Go with them if you're on the fence might not be the cheapest but for this much money stick to a UK company.
The delivery was next day by DPD and it was brand new as described.