Replacing a bottom door seal (threshold seal) on an external house door. Stormguard slimline seal

Oldmanwith a little job to do, the threshold seal on an external door is worn out and needs changing. Showing you what was wrong with the old one, how I cut and fit the new one and something I discovered in the process of fitting it.
Tools used:
Wiha folding rule: amzn.to/3qhmP3l
Bosch battery screwdriver: amzn.to/3rMGDf6
DeWalt speed square: amzn.to/37dcUnE
Tracer marker pen: amzn.to/3d8Jmvb
Draper junior hacksaw: amzn.to/37s1EnR (mine’s really old so slightly different)
Stormguard threshold seal: amzn.to/3rQmFjD
Broadfix shims (packers): amzn.to/3tXhVKP
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Comments and questions below or on the website, I’ll try to answer if I can.