I expect that studying Electronic Engineering at King's College will be a good choice. My comments are based on my prehistoric experience.
KCL is not new to teaching (or researching) electronic engineering at all. They taught this for decades before I went there in 1989 to study on their IEE-accredited BEng(Hons) Electronic & Electrical Engineering programme.
Unfortunately, at some point in the following decades KCL's engineering department, the oldest in England, was closed down, although I think they retained some staff, to continue postgraduate activities. I think that when KCL resumed undergraduate engineering, one of the world-renownwned professors that had taught us certain electronic engineering subjects was now still in a very senior position there, which indicates to me a continuity of electronics teaching there. When I did my taught MSc in a electronic engineering field at an unrelated (ie non U of London) university a few years later most courses were taught by staff brought in from other universities or industries around the globe: and half of those were seconded from KCL and recognised me.
When KCL merged with the old Chelsea College London several decades ago, KCL's electrical engineering department absorbed Chelsea's highly regarded Electronics department.
My experience of KCL's electronics subject teaching in the early 1990s was that it was designed for those with good A-levels in maths and physics and not ideal for those with perhaps one of those plus e.g. a HND in E&E Engineering. In those ancient times, a _few_ of the (long retired) lecturers were not good at teaching, despite their obvious mastery of their subjects. However, the other academics in the department did teach well and some wonderfully well, making us easily understand any supposedly difficult theory.
Like every UK university's E&E Engineering department KCL's had good links to the pertinent Professional Engineering Institution that accredited the electronics degrees, which was then the Institution of Electrical Engineers (IEE), now the Institution of Engineering & Technonlogy (IET). As far as I could see KCL's E&EE dept staff had particularly strong active connections with the IEE (now IET). The IET is still located a short walk away by the other end of Somerset House, so that access to its library is very convenient: they can provide any electronics etc journal etc if you might not find it at the KCL library. I could also study more privately at the IEE library, until my classmates discovered the place too.
In those days a BEng(Hons) or MEng dgree programme could only be accredited by a PEI if it was in a named discipline of that PEI, eg "Electronic Engineering" etc for the IET. So a degree such as the "Combined Engineering" BEng(Hons) that used to exist at Coventry was not accredited for that reason. I'm very surprised to hear that KCL's undergraduate degrees were not accredited when the OP posted - surely this is not still the case(?). Graduating from a non-PEI-accredited engineering degree used to simply delay your CEng registration and did not used to reduce your employability much, but that's probably changed. I'm embarrassed to say I scraped through with only a "pass" i.e. ordinary BEng, which is remarkable for somebody on a BEng(Hons) programme. I subsequently "topped up" my BEng with a relevant MSc to satisfy the educational requirement for CEng at that time.
It's fair to say that (more than 30 years ago), my experience of staff, academic and otherwise was variable with some "randomness".
My assigned personal tutor there was superb in both teaching and his pastoral role, managing to give me and the others in the tutor group excellent advice and help in response to every enquiry we made.
During my time there, the atmosphere st KCL was excellent and friendly: a relative who recently graduated in an unrelated subject told me it was still so.
When I was at KCL and until the engineering department closed, its reputation in electronics research seemed (to me) unsurpassed in the UK and very highly regarded worldwide - as I discovered when I spoke to electronic engineers in the USA at that time.
Finally, I can report that most in my year of KCL E&E Eng have done either very well or spectacularly well in their careers, although too many went into much better paid things than engineering, eg primarily the City, CEOs, a foreign government minister, a govt. advisor - again in his home country, etc. In contrast, those that I'd studied with elsewhere for a HND in E&E Eng.(then the educational qualification for IEng) mostly stayed in the field before moving into IT work.
My fellow MSc colleagues in various elecronic engineering fields at another university mostly remained in E&E Eng where they have had successful careers, some spectacularly so.