I put Halfords ones in my Xantia and an unknown brand from one of the
local Stroud spares place (Karparts) in my BX and they were both fine.
Other than that GSF

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Malc

bosch duratemp  available in most halfords i think. Normally A little
pricy compared to other brands but well worth it.  Make sure if your
car  has post heat glow plugs you get the right type.