yeast-erday all my troubles seemed so far away

[beer today]

so, I have done my 2nd AG, a TTL, seems ok, however I realised my new electronic temp probe seems to have failed and not sure what temp I actually pitched my yeast- SO4, anyhow 4 hours into FV and I remember last time I already had a frothy head forming, I have nowt currently. I do have a sachet of Nottingham yeast, should I just give it a stir and add the Nottingham, or just give it a stir and leave it until the morning and then add the Nottingham.
thanks

[Jerry Cornelius]

I use S04 a lot, and if it was me, I'd wait until the morning. And if it hasn't started, then I'd take remedial steps.

I don't see much action after 4 hours myself...

[Eric]

Don't panic. It will vary and if it's cooler than last time it will take longer. You don't get a mountainous head with SO4. Can you see any brown/white pea sized or bigger items floating just below the surface. If so, they'll grow, watched or not.

[beer today]

fair do's, i may just sleep on it then.
cheers

[beer today]

we maybe have the beginnings chaps, I have the X Factor, small froth developing, will sleep easy tonight !