Thank you so much for the detailed answer that's very helpful.
1) Thanks for the CSS work around attempt however the logo itself shrinks but doesn't revert back after scrolling up again as you can see from my screenshots below. It's pre-shrunk and still glitchy when scrolling... (cannot capture the glitch in a screenshot unfortunately as it's quick but you can see it jump mid scroll)
I was sure that we were supposed to be able to carry out this function without the use of additional CSS.
1a) I forgot to ask in addition why I can't seem to adjust the size of my logo in the native Pro settings too? I have always been able to adjust the size of my logo in my many previous X installs but Pro will not allow me to have a custom width without using CSS? Should I be able to adjust my logo size with Pro as a standard to void the above? I have two options "retina" or not - neither allow me to adjust the pixel width manually...
2.) You were right with the rev slider links problem - there seems to be outdated advice from theme punch which is the only info that comes up on google search https://www.themepunch.com/faq/hyperlinking-post-based-sliders. Thank you for the fix, I have implemented this on my offline version and made some major tweeks so this entire slider in the staging area can be disregarded.
3) R.E pHp version - that is correct on the live version but on my local servers I have pHp 7.2 so this leaves me scratching my head somewhat... it's coincidental that this particular staging area is outdated but I've since updated to pHp 7.2 and increased my time limit to 300 yet still having the problems.
This is indeed a bug in the Pro theme from what I can see in the forum and I'm not able to develop the front page further without deleting everything first.
4) Using SuperFly with Pro header. I'm assuming that there is not a native way of achieving the superfly layout and functions in the Pro header without using SuperFly? If there is could you point me towards the relevant knowledge base?
5) When under 750px or mobile view you will see that the logo aligns left for some reason. Is there a native control that allows me to align the logo in the centre the way it is supposed to be as I have my hamburger menu aligned left. This relates to question 4 of course because if there is a way to use Pro without SuperFly then I will do so.
Thanks for the heads up on skeleton mode! That's very helpful and I do already utilise it however it's nice to be able to use the full function in an ideal world particularly when you build offline like I do and everything is instantaneously responsive making build time much faster. I do not rely on internet speeds when building so this function should always work.
Many Thanks for all of your help in this matter.