Further study in physics after a natural sciences degree?

I'm applying to university for next year, and have received an offer from UCL to study BSc natural sciences. If i were to go to UCL, I'd most likely choose physics and physical chemistry as my streams, with physics as my major focus later on. Right now, I think I would most likely be interested in continuing to study physics afterwards, for a masters (or beyond, but that's so far into the future that I can't say for certain). I also have applied to some pure physics courses.
My worry is that studying natural sciences rather than physics could make it harder to be considered for physics postgraduate studies in the future, as naturally I wouldn't cover absolutely everything a pure physics student would during the natsci degree. Is that a legitimate concern? I do think I'd enjoy studying natsci more than pure physics, but if it limits my options later then I wouldn't be so sure.

Not necessarily a barrier. Ultimately a PhD is a very focused project in a specific area and in most areas you aren't going to use every field of physics. You may also find in some areas the background built up by whatever other area(s) you study are very useful. So you may have as good a chance or even a better chance.

Masters degrees will probably be less choosy but you may just not be able to take certain options within the masters course if they require a particular background previously. I think if your "major" area is physics, especially given a "minor" area in physical chemistry most physics masters courses would be reasonably satisfied you've covered a suitable range of relevant material.

Looking at the course options for UCL I think it would be hard not to cover basically more or less everything you'd do in a physics degree anyway (granted some of it from a physical chemistry perspective but it's the same stuff...) unless you just completely chose not to take any EM options or something (which would probably be inadvisable). Physical chemistry is pretty much just the QM and thermodynamics/statistical physics material physicists do anyway, just usually with a touch less mathematical formalism perhaps?

I'm applying to university for next year, and have received an offer from UCL to study BSc natural sciences. If i were to go to UCL, I'd most likely choose physics and physical chemistry as my streams, with physics as my major focus later on. Right now, I think I would most likely be interested in continuing to study physics afterwards, for a masters (or beyond, but that's so far into the future that I can't say for certain). I also have applied to some pure physics courses.
My worry is that studying natural sciences rather than physics could make it harder to be considered for physics postgraduate studies in the future, as naturally I wouldn't cover absolutely everything a pure physics student would during the natsci degree. Is that a legitimate concern? I do think I'd enjoy studying natsci more than pure physics, but if it limits my options later then I wouldn't be so sure.