OB 1-G

My spouse died in a work accident in Canada last year, and I receive a lifetime monthly payment from the workers compensation board as the surviving spouse (for myself and 2 kids). The payment is not taxable in Canada (although reported to the CRA). I am moving back to the UK in order to be closer to family, and I am not able to find any information as to whether this tax free income in Canada would be also tax free once I am a resident of the UK. I would greatly appreciate any insight, since it would make a huge difference to my finances.