I have to say that in terms of sheer enjoyment and ingenuity in clueing, this was my favourite puzzle so far in what has been a cracking year.
As my username betrays, I have a passion for the football team located in 37ac. I also live in Waltham Forest. And I can confirm that 37ac, while hardly 'monstrous', certainly wasn't one of the capital's more desirable postcodes 20 years ago. Now, though, some neighbourhoods are very much hipster central.
Thanks Artix - from title to finally realising how the misprints work, this was great fun. Helped not inconsiderably by a 3-1 win on Saturday!