I see this is an older post... how are things going?
I have made 2 or these kits, the first one, I didn't have "Cooper's Brew Enhancer" available but did have Munton's, so I made it, but didn't know the difference in brewing at Lager temps, it brewed up pretty good but had an estery taste as it was brewed at room temps. However, this was Septemeber I think and now, the brew is AWESOME!, I still have about 20 left.
The second batch, I used two cans of malt and no added sugars, brewed it at an ambient temp of about 57-60F and kegged it, I won't be cracking the keg for at least another month but the warm, flat brew going in tasted excellent. Very much worth the wait.