I don't like to get entangled with some food debate but I thought the common knowledge was that tikka masala is from Punjab. The restaurant owner who claimed to have 'invented' tikka masala using canned soup confessed they had spun up a story to entertain journalists.
Could entirely be. I just remember seeing the UK as a country of origin when looking for a slow cooking Tikka masala recipe and being disgusted with myself for enjoying English cuisine. Like there was no warning, no beans involved or anything.