Could be. That was just the way I interpreted his look and how he said he was in a really dark place. Looks like it’s meant to be left ambiguous according to the actors? Who knows.

https://metro.co.uk/2022/11/28/white-lotus-tom-hollander-unsure-hes-leo-woodalls-uncle-after-sex-scene-17840565/amp/

Either way, I wouldn’t put much stock in the accents being different. I have a different accent from some of my aunts and uncles. If you grow up in different areas, it can happen. They’re both British dialects at any rate!