Yes, I heard they want more proof other than a passport to show that you reside at an address there, a document with your address on. And showing I have £1000 entering my bank every would be difficult because I get paid in THB and EUR entering two bank accounts that are not British. So hopefully they will be okay with only accepting the 400k savings. This is my concern.
can you tell me if they would accept a UK driver's license as proof of residency. Even though none of my family reside at that address anymore. Also will they accept 400k in a Thai bank account in my name as proof of funds?
you can check at your local immigration office whether they will be able to convert an exemption stamp to a non-o based on having family members working in Thailand. I think it's possible. It will save you a lot of hassle with going to Laos and making appointments at embassies.