Hi there sheiladrums and welcome to the forum
Your bird is a bit of a puzzler. It sounds like you've ruled out Jay and Green woodpecker, which are probably the most exotic-looking native birds likely to visit gardens, so it probably is an escape.
A photo is essential here, I think. To learn how to upload, click on the "info" icon in the bar at the top of the page, then click on "how can i upload photos to forum posts" for full instructions. I'm looking forward to seeing this
What part of the country are you in?
T2