No advantages over the coolant reccomend by Ford or Caterham. The issue is the potential for deleterious affects on chemically incompatible non-OEM components throughout the system.
Generally, all coolants cool the same, with alternatives like gells, water wetter, etc. being the exception, standard long life coolants differ in how they interact with the components they are in contact with. They work together as a system. When a coolant is recommended by an OEM, there is usually a materials compatability issue.
If a coolant of any kind looses its effectiveness its likely something has happened to that coolant to get contaminated and change its properties.
This is why a good flush is necessary. These 7s tend to sit for long periods leaving the coolant ample condition to sit and eat away on a rubber seal or gell and cryatalize from a remnant of an invasive element introduced like an additive or previous coolant or some other corrosion.
Getting a clean slate baseline to work with from a flush and refill with an OEM approved coolant is your starting point for troubleshooting the other issues.
Also, just plan on making your coolant system a regular maintenance item. Coolants, like brake fluid, go bad over time and contamination, not from use.