Laguna 1.9 DCI Over heating

Well, it looks to me like the thermostat in my Laguna Estate is on the way out, so, looks simple enough, follow the heater hoses back, three bolts, one electrical connector.... however (don't you just love that word "however" )

There appears to be a knurled screw head on the thermostat assembly, is this a further bleed point and if so, how in the refill process is it used and also, is there a cylinder block drain facility or is it just a case of dropping the bottom hoses and letting gravity do its work?

Thanks in advance

Currently in Wolf's garage:
2003 1.9 DCI Laguna Dynamique Estate, 1990 Jaguar TWR XJR 4.0, 1993 Jaguar Sovereign 4.0

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Laguna 1.9 DCI Over heating