I didn't know where on the forum to ask, so please let me know if it needs moving.

I agreed to make a custom rat sculpture for someone who saw a previous work of mine. I am about to start painting it, but realised that I had no idea on how to post it!
I'm partially talking about how to wrap and pack it, but also on what service to use. I am in the UK and the mail service here (bless them) are not renown for treating things well and I've had two smaller pieces break this week in transit alone (my fault for posting in bubble mailers rather than boxes I guess!).
This is the item WIP:

Has anyone else successfully posted polymer clay items safely if they have been more delicate items? I commissioned a small piece 5-6 years ago which had a few delicate areas which arrived from Australia just fine, but it was a much smaller, lighter item and I cannot remember at all how it was packed!