30 seconds with a Google search for "sherborne recliner power supply" will probably throw up any number of useful results- including Amazon.
acp
March 2017
Julie - this is not a retail site so you can't buy anything here.
Search online for Sherborne Recliner Parts.
You do not describe the damage to the transformer - electrical or mechanical.
You may have trouble sourcing a replacement transformer - if you can discover input voltage - output voltage and Wattage then anything that matches will work. You may need someone to help you with connecting up.
Good Luck...
March 2017
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix chairs.