The expansion bottle from the standard scimitar needsto be higher than the thermostat housing, but the shape of the bonnet does not permit this easily.
Having seen Mr towed arangement with the modern 2 stage pressure cap.
I considered an addition of a length of piping with a cap.
However, ford provided a more elegant solution in the form of a modified thermostat housing.
The expansion bottle can now be fitted low behind the front wheel arch.
onto the nex problem, relocating the battery.
HM