hadw
The original report is essentially correct, although the precise occupation of the building is unclear.  There is a door on the left (opposite end from the marker) with a big ENTRANCE on it and a name plate for the company, and the address 2 Junction Road HA1 1NL (so another postcode down!).

 I would treat the bit starting ADRenaline as a tag line, rather than part of the name.  Whilst the sign suggested recording studio to me, there was nothing explicit.

Also, the occupation of the building as a whole is unclear.  There is a door nearer the middle of the frontage, with no name on it, the windows have both a list of legal services, with some letters missing, and no branding, and also "The Apostle's Continuation Church", twice, in intact lettering.  As such it may justify PoW tagging.

The board above the windows has had a name crudely, but effectively, painted out.  I seem to remember the church branding being more prominent in the past, so I suspect the church is no longer there.

At a guess Voicearchive has the top floor and the ground is void.