There are planning consent considerations - it depends on your local Council - planning rules are down to local Councils to decide.
Where I'm based you can offer beauty and massage services in offices with D1 use which is consulting offices.
Most offices are not intended for customers to visit. B1 class of use is for office admin activities without visiting customers.
Some offices have B1 and D1. A landlord won't want to convert a B1 office to a D1 but usually they are OK about adding D1 to an existing B1. You have to stress that you are also managing your business in the premises: dealing with email and telephone enquiries, bookkeeping, ordering stock supplies, updating your website and marketing materials and undertaking self study CPD. If you want to apply for a B1 and D1 use it helps if you have other business activities not in the office which can be managed and coordinated from the office - things like mobile bookings, pamper parties in air BnB's, providing treatments in hotels, training in other salons, you get the idea.
I know quite a few therapists who work from office rooms. I've done it myself with 6 flights of stairs to climb to get to the loo and a kitchen sink. I didn't do pedis. I had a big airpot which I filled up with hot water, a hot towel cabbi and a mini chilled water dispenser which I hired for £10 a month. I had a screen and a big piece of furniture by the door creating a "lobby" so we were private if anyone walked in - and I had a key...