Brother your question is unclear [at least to me].
I guess u r suggesting that your CHC is London & u have, or plan, to go back to your country. And how about the interview or Meds.
If that's the query, plz be informed that the need for interview or request for meds, vis-a-vis your home return is immaterial.
The interview, if called for, must be attended at London [or the affiliated CHC location] until u don't change your visa office. Meds can be done with any DMP in any city/country.
Qorax