A property used as a hmo is classified as c4 under the town and country planning use classes order. A residence for a family is c3.
Therefore you will need to change the use.
This is very simple as a change from c4 to c3 is permitted development.
You will need to put in a planning application to the council but it will be approved under permitted development.
Best to apply for a lawful development certificate. You can do it online.
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I know that to change c3 to hmo exceeding 6 people needs full planning.
Check with the council to see it it is registered as a c4 or sui generis.
If a full application is required, speak to the council first to establish if application is likely to be accepted. The process is 8 weeks. You could enter into a conditional contract to buy > conditional on grant of planning. If you get it you complete, if not you walk away.
Another alternative is a lock out agreement, the seller will not deal with anyone else during the lock out. Period needs to be long enough to cover the 8 week planning process.
Apologies, I started to type before your additional note that it was 7 bedsits. I am responding on a mobile phone with a small screen.
I think the property will be classified sui generis and therefore will require a full application.
Via planning portal you can apply for the full application.
To cover your position, just in case planning is refused, proceed with a conditional contract or lock out agreement. Speak to planning department of council before making the application to establish what they may require from you in your application.
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If you do so without permission you will be in breach of planning and the local authority can take enforcement action against you. If you proceed without there is a 4 year limit within which the local planning authority can take enforcement action.
As to what considerations you can put forward, the planning authority does have considerable discretion and is generally not bound by any previous decision it has made. Have you spoken to a surveyor?