Design & Alterations
https://www.designandalter.com/Dressmaker, Alterations
TS Kane
Design & Alterations are very good, especially with items of sentimental or material value and they specialise in wedding dresses. They are pricey.
Diba Dry Cleaners & Tailors
Alterations
Helena Ware /Monse Cisa / Will and Rich / Henry and Joyce / Katie Chapman &c
Francis of London Tailors
https://francisoflondontailors.com/Dressmaker, tailor, dry cleaning, alterations
TS Kane
I’ve also had great experiences with Francis of London on Lavender Hill. They are amazing and their prices are very fair.