The Ice Booking booking component combined with the sage payment gateway was found to be no longer supported when checked yesterday. A careful look through the joomla extension gallery and I identified a perfect replacement called Rentalot Plus. This joomla component was familiar to me because I'd used the free Rentalot version some years ago so was delighted to see a "plus" version with free and easy to configure payment gateways. It was ordered, delivered digitally and configured on a test site within a couple of hours. One transient bug in the menu configuration was very quickly sorted with very prompt replies from the component software provider, Les Arbres Design.
Joomla is a versatile content management system with well designed specialist components for many different functions and sectors.
End result is that the Fell View Cottage website has been updated with the new owner contact details and booking / payment system. I set the weekly price for a couple of weeks in 2019 at £15 for live credit card testing, of the STRIPE payment gateway which also worked just fine.