I did a DIY mod on my two MG Midgets and the MGB GT: Got a coffee jar, quarter filled with water/anti-freeze, drilled a small hole in the lid, strapped it securely inside the engine bay and fed a tube from the radiator overflow to it, tube taped tightly into top of jar. Hardly ever had to top up the radiator as was normally the case (beacause the overflow pipe discharged onto the ground!).

Interesting times.

PS. Suspenders, Richard?!!