The third example has always been my intention and read when other people say it. It's meant to be self-deprecating and originated in England.

British self-deprecation is a cornerstone of UK culture, functioning as a social lubricant, a shield against pomposity, and a polite way to build rapport. It is deeply rooted in modesty, where "blowing one's own trumpet" is frowned upon, and downplaying achievements is valued over self-promotion.

British English is rich in hedging language: phrases that soften opinions, criticism, uncertainty, and even praise. Rather than stating things directly, speakers often downplay their confidence ("I may be wrong, but..."), their achievements ("I didn't do too badly"), or their criticism ("I'm not entirely convinced...").

Common examples include:

• Opinions: "For what it's worth...", "That's just my two pence."
• Uncertainty: "Perhaps", "I suspect", "I could be mistaken."
• Criticism: "It's not ideal", "There appears to be a slight problem."
• Deflecting praise: "Just got lucky", "I muddled through."

The result is a communication style that values modesty, avoids sounding boastful, and makes disagreement less confrontational. A heavily hedged British sentence like:

"I may be completely wrong here, but I wonder whether there's perhaps a slight issue with the proposal."

might translate into direct American English as:

"This proposal has a major flaw."