I understand, having looked very recently, that a typical boiler replacement cost for a modernish 4 bed house is ~£2500-3000.
However if boiler is 38 years old there may be a load of additional work advised as much of the system will, I assume, be of similar vintage.
Even if not currently defective - radiators may be corroded or silted up, hot water tank may be time served, pipework may need significant modification, thermostats pumps and heating controls may need updating.
It's your call whether you spend the money now to get an updated system which may run for years before further work is required, or go for cheapest immediate option with risk of future failures.
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