Re the older two pictures of 6 Hoxton Square:

The basement was where the servants were then on the left Arthur Hyatt
lived with his family and on the right lived William or George (as they
all had a go in the business at one time or other).
The two floors above was where the business was ran as the light was best 
there for sewing.

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Email reply from David Nicholson, Architect.

      Date: 01/23/05 11:23:14
      To: Jon Hyatt
      Subject: 5&6 Hoxton Square

      I have been passed your email enquiry in regard to the above.

      We purchased this building in September 1993 from the London
Borough of Hackney and developed it to provide small office and studio
spaces. I attach photos showing the front and rear taken at that time
and you can see it was in a very poor state of repair. We understand
prior to that it had been derelict for some 15 years having previously
been used as municipal offices by the Council. I would guess that
Hackney Council acquired the site together with the buildings at the
rear from the London Electricity Board who operated a power station here
in the early part of the 20th century.

      When we developed the building it seemed that much of the interior
structure was of later construction than the front facade and so I'm
not sure how much of it, as it is now, would be recognisable to your
ancestors. Also if you look at the Ordnance Survey map for 1893 you can
see the property extended much further to the rear. It may be that the
present building was constructed after this date. Incidentally, the 1893
map notes the occupier of No. 6 as A&W Hyatt, tassel and girdle
manufacturers.

      I'm sorry I can't give you any more definite information. I'd be
interested to know if you discover any more about the history of this
building.

      Yours sincerely

      David Nicholson