If you can't get the Hovis Lower Carb (Big Tescos and Morrisons sell it) which is a good substitute, then a wholemeal/seeded bread that's also high in fibre will be a good change anyway for a start. A lot of people here have Nimble bread, or Burgen loaves, as they're also better than normal bread.
Have you tried keeping a food diary as well? I found this to really help me in conjunction with my readings, as I could see what might be causing issues. And I tend to try things a couple of times, just in case. You can have the same meal one day to the next and get differing results, so it's worth getting a bit of a consensus with your testing.
I am often higher in the morning than later in the day. It's infuriating, but there doesn't seem to be a lot I can do about it. If you focus on getting your diet right, then it'll all hopefully feel a lot better. But as others have said, there's no rush right now in you getting your BG test readings down between 4 and 7, like tomorrow. It takes time and it's worth taking the time to get it to become comfortable for you in the future.