Yes, Jim seems to leave a trail of destruction in his wake yet prides himself of being a nice guy. Sarah hasn't really had time to catch her breath since matching with him online, as least Tanya had the money and the network to get outShe is a normal size. I saw her in Oxford Street pre-baby. I think she's a size 10-12. She was slim but didn't look emaciated like her insta.
Personally I think her natural auburn hair was stunning and unique and she looked better curvier. But I suspect skinny Jim was behind her losing weight. His wife has lost tons of weight post childbirth.
(He was probably a lot more scarred by his childhood than he thinks, their Dad and Grandad sounded like they were awful to the children)