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I'm an electrician. Whilst fitting a transformer inside a consumer unit (CU) seems a neat solution, there are some considerations.
I'm not aware of any manufactured CU transformers (might be wrong), that do not required to be fed by an over current device, e.g. mcb. You therefore need 3 spares ways, although it could be fed via an existing mcb. This removes scope should new circuits be required in the future.
The cable from the transformer to the Ring, would need to be suitable for low voltage (inside the CU), bell wire will not suffice. If the ring device is some distance, then cabling to factor in volt drop will need to be considered.
You should not be installing a different manufactured transformer in another manufacturers CU, i.e. if you have a Wylex CU, you must install a Wylex transformer.
All in all, I would be considering installing a stand alone transformer near the Ring device.
Do not try & install low voltage devices or equipment yourself; you need to be a competent electrician and have suitable test equipment. If its a new circuit, as your suggesting, it needs notifying to local building control (England & Wales). IMO £200 for the installation, testing, certification & notification for a new circuit is not excessively high (especially in London). Its not a days work, but doesn't leave a lot of the day left to do anything else.
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