changing middle name after changing first name

I’m a bit confused on how to do this. Originally I just changed my first name because I was desperate to do it, and couldn’t think of any good middle names. However I have used this deed poll for only a couple things, such as jobs and HRMC, but I am yet to do it with IDs because of my severe procrastination issues mainly.

Now I’m going through with the ID stuff I want to make sure everything is how I want it, but making a new deed poll seems confusing. Would I write “I (current name) am changing my name to this”, and then keep both deed polls together, sharing them as two paired documents (this one makes more sense to me) or write “I (deadname)” and effectively make a brand new deed poll and disregard the old one?

Another thing, with changing IDs and sending off deed polls, did anyone find it hard without an approved photo copy?? This is another thing that has been adding to my procrastination but I was wondering if it’s actually necessary or if they do send it back.