Abakhan Fabrics have stores mostly in the North West of England, with a large shop in Mostyn North Wales. I don't think they do shows. When I shopped at them there were lots of fabrics you could buy by weight, and mixed bags of buttons, zips etc
https://www.abakhan.co.uk/I visited the Chester shop some years ago. At that time it was quite small but smart, and for Abakhan quite expensive, no fabrics by weight or prepacked grab bags. However its over 10 years ago, so not sure what it's like now.
Jaycotts are on an industrial unit site a little out of the centre - you'd need a car to get there I would think.
https://jaycotts.co.uk/Only open Monday - Friday from 9am to 4pm
Jaycotts, Unit D2, Chester Trade Park, Off Bumpers Lane, Chester, CH1 4LT, UK
Tel: 01244 394099
Again I've not been for over 10 years but the photos on their website show it as I remember, but the customer area smartened up