Today I checked the coolant level and all seems well. Then I had a quick check around the engine bay and saw that the short length of hose from the purge valve to the non-return valve on the EVAP system was starting to split at the end, so I replaced it with silicone. A quick suck to check the valve was working - and it wasn't
I could blow both ways once it was off and cleaned.
The Saab replacement is difficult to uwork out because the parts list shows a diagram for the old EVAP system, LHD, RHD, USA, rest of world, etc. so which part is which is anyone's guess
And anyway it comes with lengths of pipe attached.
So I ordered an aluminium valve from eBay which will get here sometime next week. Then SWMBO reminded me that she needed my car to go to Northampton on Saturday...
I looked for valves elsewhere, but found nothing. On the way out to a meeting this evening I stopped at Halfords, just in case; but they had nothing. Then I remembered Midnight Motors which was also on the way. I went in and asked. The man reached behind the counter and said "Which do you want. 6mm, 8mm or 10mm?"
The Saab valve is, of course, 6mm on one end and 8mm on the other
I know what I'll be doing tomorrow...