This addon will update the special price (if the product is on special) by the same percentage as you are changing the product price. in standard Phoenix the special price remains unaffected by base price changes, EG
Shiny Red Apples at $5, special at $4, a $1 saving (equivalent to 20%).
Shopowner change the price from $5 to $6, the special price remains at $4, now the buyer has a $2 saving (equivalent to 33%).
With this new addon, this is no longer a worry. The addon looks at the percentage change of the base price and applies the same percentage to the special price, EG
Shiny Red Apples at $5, special at $4, a $1 saving (equivalent to 20%).
Shopowner change the price from $5 to $6, the special price changes to $4.80, a $1.20 saving (equivalent to 20%).
In this way, you can be sure that your special "per cent" will always remain the same with respect to the base price of the product.
£20