This creates on average £25K income (for my salon)...

I would like to see a feature with a mix of special offers/product/voucher Phorest feature.

I (and lots of our Salonology/Phorest community) use a simple software called Robovoucher - especially helpful at Christmas we offer limited-time advent deals - we can set up a list of deals available for 24 hours, with dates/times set, so they are only available for a set period of time (and set up in advance, without having to make live manually every morning, and prepare for xmas rush).

Currently I set up 24 deals (which are off menu treatments, eg. Secret Santa Facial will be an adpated facial we offer, with added touches), with 1 deal going live daily between 1-24 Dec. Customers cannot see what is available during the month. Deals are limited in numbers (eg. 10 available creating sense of urgency).

Voucher sales are then only available to use (explained in t&c's) to fill up white space after xmas. Below is a screenshot from Robovoucher, showing how easy it is to create.