Rallye possible cooling h/g problem?

[Niall]

Mine does the same sometimes and sometimes when it gets hot, it pushes coolant out of the overflow. Reason being is that the top of my radiator is damaged slightly so it wont allow the cap to lift under pressure like it should. For the sake of £6 from peugeot, i would get a new rad cap, bleed the system through completely and monitor it. 75-80 is slightly low. Have you got the fans running constantly?

Also, you will want to look at doing the belt soon if i were you. most do them at 25-30k max due to there being such a high failure rate.