It's great to have a haberdashery in East London rather than having to head towards Oxford Street. I also hear they run sewing classes, which I'm hoping to join to brush up on my sewing skills.
My advice is that if you need help or guidance, ask to speak with one of the experienced staff members straight away. Unfortunately, the service I received at the till wasn't particularly helpful, and I found the interaction quite dismissive. Once I spoke with someone more knowledgeable about the best insert for my dress, I got the advice I needed.
That aside, I'm glad to have a local haberdashery nearby and will be back.