Taken from https://county-courts.co.uk/small-claims-court/:
The financial value of small claims court cases
To be placed in the small claims track the financial value of the County Court claim being presented must be less than £10,000. Cases involving personal injuries will be allocated to the small claims court if they do not exceed £1,000, while disputes between landlords and tenants are also only applicable if they the amount being disputed is less then £1,000.
There are rare exceptions where, even though the financial value of the case, both parties agree that they would like the proceeding to take place in the small claims court. While this could mean the dispute is settled more rapidly, it also means that the normal rules of the small claims track are thrown out the window, and each party becomes potentially liable for the others legal fees, including solicitors costs.
Common types of small claims court cases
Compensation for flawed services and negligent professionals
Consumer disputes over defective goods and breaches of contract
Landlord and tenant disputes over missing rent or failure to repair the property
Non-payment of wages or other debt related disputes
If the value of the stuff is high enough the court might not be able to hear it and the small supplier risks being sued into submission by a company with much deeper pockets.