If you are a council housing tenant and therefore the council is your landlord, yes you do need their permission, and no they will not give it to you - they will most likely evict you I would imagine.
Working from home (as many office based employees did during lockdowns) is practically and legally very different from running your own business from home. The former is usually allowed and you don't need your landlord's permission. The latter (running a business from home) is almost always forbidden by your tenancy agreement and doing so will result in an injunction/eviction.
The Small Business, Enterprise and Employment Act 2015 introduced the option of having a 'home business tenancy', basically a different type of tenancy agreement to an assured short hold tenancy, which permits tenants to run a business from home with the business type specified and agreed in the contract.
I don't know anyone who has ever had or even considered one of these but trust me if you asked for one for prostituting from home the best response you could hope for is the landlord laughing in your face.
Bottom line is, get a different accountant.