Re Joseph Grout in 1813 He and brother George had turned away from family occupation of Saddlers, Harness Makers etc and had founded the product of silk crepe. They joined with Baylis brothers and set up Grout and Baylis in Norwich and Enfield ( Grouts also there as saddlers).
https://www.gracesguide.co.uk/Grout_and_Baylis
I also have a marriage for Joseph Grout to a widow Elizabeth Miller at St Dunstan, Stepney in 1801. Wasn't sure it was 'our' Joseph Grout until looked closely at witnesses and it was James Williams (and Eleanor Brown)
There's lots of info about the Grout crepe/crape mills on Google.