Sorry for not responding earlier, I must have missed this for some reason. Your document list looks good to me.
- For her old passports, you should supply/give details ALL passports ever issued, not just in the last 10 years. If she cannot supply all of them, just give as much detail as you can on the application form and explain that the passport is lost.
- The IHS surcharge is paid as part of the online application submission - you will be directed to the IHS website to pay it.
- Which financial requirement category are you applying under? I assume Category D: £62,500 in Cash Savings, since you only mention bank statements? Just make sure they cover the entire 6 months and not a day less, and that the balance did not fall below £62,500 even for 1 day during the 6 months.
- For the accommodation, the letter from your parents needs to state the number of bedrooms + living rooms, along with the total number of people who will be living in the house... to show it will not be overcrowded.
- For the screenshots of emails/calls/texts, you should only include 1-2 pages of each in total, covering the entire relationship. No email or message content should be included, you just want a list of dates, times and subject lines.
- It depends how long a time you need to cover as to how many you include. If you're provide a 6-month long-distance relationship, you might want to include 2 emails, 2 calls and 2 texts per week. If it's a 5-year long-distance relationship, you might only include 1 email, 1 call and 1 text per month. If it's 10 years, then maybe 1 every 2 months.
- So, you should be able to get all your emails onto 1-2 pages, all your messages on 1-2 pages, and all your texts on 1-2 pages... giving 3-6 pages in total for all of your correspondence.
- I think you'll probably be fine with the photocopy of the tax return - it sounds like you have plenty of other solid evidence for your relationship.