Time to move away for me as well.
Yes I got caught unawares when the invoice for my domain renewal came in the email this morning. Searched and not found any warning email from 123 about the 20% price hike.
Moving mine over to Pixelinternet who I have been happy with for the last 5yrs and they host my website so they may as well have my few domains as well. Plus Pixelinternet give limited free email boxes with each domain so you can use your domain for email easily without buying web hosting. I used to get this with godaddy years ago but not any more.