To add my thoughts, which may help on the comparison.
I have a 13’ M1 16GB 512SSD bought last Dec, upgrading from a 15’ retina i7 16GB 1TB 2015 which worked well but was bulky.
Have used Macs since the early 90s and like having solid kit - primarily do photo then video editing (note: the MBP is a creation tool, I use an iPad Pro for most content consumption).
I knew that updated models would come in Q3/4 this year - so initially planned to sell the 13’ for the newer design similar RAM/SSD model when it arrived.
Went into a store last weekend to confirm my thinking & buy one - compared them side by side for a good 10 mins, now not so sure I want a new one. It’s boxy and bigger than I expected.
The 14’ has MagSafe fast charging, a better screen refresh + picture on HDR, function keys, faster vid editing and more ports - but worse battery life and a heavier/boxy design.
My 13’ is sleek, light and munches through everything I need currently - charges fast, has a solid screen, photo edits like a boss, edits 4K video quietly, stays cool and most importantly has amazing battery life.
The extra ££ to upgrade is not so clear for me, unless video editing goes significantly 8K only in the next 2-3yrs - I think am good with the 13’.
My final thoughts are the 13’ is a solid option if you can get a well specced one for £1200ish through Apple refurb, on sale or as lightly used in mint condition:
-> that £800 gap is quite significant and may beat out the 14’ base model for your use case.
-> if you value portability and battery life, the 13’ May beat out the 14’ base model for your use case.