I have a Halifax Clarity Credit Card. It had a £10,000 GBP credit limit. I liked that as it would have been useful in case of emergency hospital treatment. I was mindful about exclusive abroad use so only used it very occasionally, both in Thailand and in U.K. Due to lack of use Halifax reduced my credit limit to £500 GBP and now cannot be persuaded to increase it.
You could tell them you are about to return to UK upon a permanent basis. However, you do not, as yet, have a permanent address in mind. You would be lodging with various friends while you seek a suitable property to buy. Hopefully, they may be able to postpone closure of your credit card account?
Previously, Halifax customer services told me I could have a Thai address for their correspondence but that they wouldn’t send renewed/replacement cards to Thailand. Would suggest you contact customer services asking the reason and if, at this stage, is there anything that can be done to prevent closure of your credit card account?
Cigna Global processed my health insurance quote over the telephone in a very short time. They are only concerned with conditions you have actually been diagnosed with, how long ago and whether you are currently taking medication? My preexisting condition was regarded as resolved and disregarded. No exclusions applicable. Their Silver Plan was $565 USD per month at my age of 68.