[tschmidlin]

What do you use for sanitizer?

I use Star San.

Ok, never mind

I find residual iodophor has a distinct taste that is fruity and tart - it kind of reminds me of sweet tarts.  Obviously that's not what is going on here.

[erockrph]

Now that the beer has had a chance to mellow out a bit, I'm also noticing a bit of diacetyl. Is this common with Nottingham?

[Joe Sr.]

Dunno about diacetyl but I sampled my London Pride last night and definitely it has a tartness to it.

I didn't do a side-by-side sampling with the ESB yeast batch, but I already know that batch has a smoother finish.

FWIW, I have also had tartness using Windsor yeast.  I thought the most recent beer may have had an infection, but the level of tartness is not increasing.  I keep avoiding dumping it...  Maybe I can dry hop the bejeesus out of it.