It is unlikely that the court would accept the evidence of a private investigator who is not registered in the UK.
It’s up to the judge but unlikely.
Even if it was a UK private investigator, the private investigator would virtually have to have caught them in the act.
I’m sorry to be the prophet of doom but to all intents and purposes, I forget divorce on the grounds of adultery unless your spouse admits it.
It’s easy to get divorced for unreasonable behaviour so being brutally honest with you, I wouldn’t mess around with adultery and I would just put a petition together for unreasonable behaviour and his flirting would certainly be one of those grounds even if you didn’t have actual evidence of sexual intercourse taking place.
Unreasonable behaviour. Most common and relatively easily to put together a petition on these grounds. For example:
A spouse wants an unreasonable amount of sex/never once it.
Lack of personal hygiene/obsessive personal hygiene.
Obsessively tidy/extremely messy and untidy.
Gambles to excess/it’s tightfisted with money.
Never interacts with spouse or children/obsessive with children.
Violent or bullying or intimidating.
Lots of grounds.
Spouses ignoring paperwork is common.
If you don’t know where your spouse is, then provided you have made attempts to contact him, there is a process for doing that where the service of documents is dispensed with:
the government to the rescue again with a website on that subject: https://www.gov.uk/divorce-missing-husband-wife
If you know where your spouse is but he won’t sign the papers, then you can make an application court for Deemed Service of the papers provided you can prove he’s had them and is just ignoring them.
Here is an article on the subject:
Can I clarify anything else for you?
I am happy to answer any specific points arising from this.
Please take a moment to look at the top right-hand corner of the page and rate my service by clicking one of the stars at the top of the screen.
You may need to login again to use the rating service. Although it says "rate to finish" it doesn't close the thread and we can still exchange emails.
It's important that you use the rating service because that gives me credit.
It doesn't just give me a pat on the head! It's what gets me paid!!
There is also an experts incentive scheme whereby the more 5 star ratings I get I do actually get a pat on the head!
All you need to do is press Submit.
If you still need any points clarifying, I will still reply because the thread does not close.