My advice, based on experience with my mother, is to arrange LPAs listing your children as Attorneys then they can help you with your finances in later years if necessary. It might take longer to organise with them living abroad as there are forms which they need to sign and return to you but it is definitely possible to do. You might also want to plan ahead for what happens after your death.
When my mum died recently, our LPAs were immediately void and her bank accounts frozen. Luckily we knew this would happen so we moved £5000 to cover expenses into an old bank account of my sisters about two months before she died - totally trust my sister! Although we are still able to add money to mums account ( necessary as her house is rented out), we can’t access it online to check the balance and have to complete a form in order to get bills paid which is a bit frustrating and slow.
We used the money in my sisters account to pay the bill for the food after the funeral as the pub wanted a deposit and final payment on the day of the funeral although the funeral directors invoice was submitted to the bank to do a bank transfer. We also needed cash to pay a couple of small bills connected to her house and to cover taxis for family to get to her funeral.
The alternative, as explained by our solicitor who is doing probate, was for one of us to pay all expenses from our own account and claim it back before the beneficiaries in her will get their share. As we cannot sell mums house for at least 10 months due to having just renewed the lease with the tenant, it’s going to be a while before the money can be finally paid out.
