I didn’t get one either gutted because I’d really love to try a womanizer too
You could contact Customer Care and see if they'll give you the code? If not you can add your Unlimited voucher and it'll let you have it for £19.99. £40/£20 does seems a bit steep for a one-use 30 minute toy, as you can get the rechargeable Starlet for £70/£50, but it does make trying it out more affordable, (especially if you're considering buying the £170 Premium model).
The free trial is a great idea though. I bet there'll be a lot of people saving up for the more expensive ones after their 30 minutes has run out. 🙂