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Cooling - Just like a Stag your cooling system needs to be kept in tip top condition. There are mods such as bigger rads, electric fans and so forth but nothing will overcome the basic need to keep the system maintained. A maintained standard system does the job just fine so why bother modifying?
In answer to your question, it is possible to eliminate a weakness of the Dolomite cooling system by removing the expansion tank
and replacing it with one that has a low level warning. With the new tank suitably positioned it is possible to ensure the warning
is activated before the coolant drops within the engine.
I have this Volvo 850 tank on my 1850.
On a Dolomite it is possible to have the coolant drop within the engine whilst the level in the expansion remains correct,
for example if you have a (slight) thermostat cover gasket leak, which is what triggered me to look to eliminate the problem.
On an 1850 or Sprint it is possible to make the existing heater more effective
(so much so that it is necessary to reduce the heat
in winter, which seems so wrong.)