Wiring of Ring Video Doorbell Pro with Existing Chime in UK (Byron 776)

Hello all, I live in the UK and purchased a Ring Doorbell Pro so I could use my existing wired door chime, a Byron 776 (very common model with mechanical chime), which has its own 8v transformer. The installation plan I had was to simply use my local electrician to follow the guide as per the european manual here: [https://support.ring.com/hc/en-us/article\_attachments/360021789811/ENG\_Doorbell\_Pro\_MANUAL.pdf](https://support.ring.com/hc/en-us/article_attachments/360021789811/ENG_Doorbell_Pro_MANUAL.pdf) The relevant page is the diagram I've attached to this post. Which means installation of the supplied 24v transformer, then wiring that into the internal chime (attaching to the terminals of the existing 8v transformer and bypassing), and using the supplied Pro Power Kit v2. However this didn't seem to work when configured this way. It did turn out the Ring supplied transformer was actually faulty, supplying 32v instead of 24v, humming loudly and was severely overheating (shouldn't it have a thermal cutout?), so had to cut short the installation. Ring support were good and are sending out a replacement which will take a week before I can continue. However, whilst I wait for that replacement to arrive, I wanted to ask if anyone else has experience in the UK in successfully installing using a similar internal chime (I like to have wired chimes just in case of WiFi issues). I have seen some posts / youtube videos where they took out the old 8v transformer completely, and wired differently, but not sure how much I trust them. Ring do list this chime as compatible, maybe they or someone here can suggest the best way forward: a) Should we leave the existing 8v transformer in place and wire exactly as per the attached diagram from the Ring european manual? b) Should we remove the old 8v transformer from the internal chime and wire similar to the random youtube video (which not sure how much I trust), diagram also attached of how I think this would look. c) Buy a different internal doorchime which is more likely to be compatible? I suppose the question is that I can't see why it would be recommended to leave the existing transformer in place? But then I'm not an electrician! If anyone has used this specific model before, or if Ring are able to share the best approach for this model (which I presume they must have confirmed as they added it to their compatible list), then that would be great. I've seen similar questions about this model asked with either no good answer. Many thanks! - MrMoo