EDIT: I'll be purchasing second hand/very cheap to start off with. Potentially these to be honest
http://www.chainreactioncycles.com/shimano-r540-spd-sl-clipless-road-pedals/rp-prod5369
If you're buying second hand you should be able to find a 'better' set for £20 or less. I've got a couple of old sets floating around somewhere in my garage and I'd be happy getting around that for them. They're a bit heavy so best to avoid postage, local facebook buy/sell or club pages are probably the best place to start (or ask friends who ride)?!
I (and many others here) switched from SPD-SL (some of us even came from SPD) to Look Keo. We've found they have nicer cleat/pedal engagement making them better (easier to flip & clip) when commuting in traffic.
In future I can see going Speedplay for the dual sided aspect again. Coming from dual sided SPD they're so much 'safer' in traffic.
Pedal threads should all be the same size BUT REMEMBER the left pedal is 'reverse threaded', with the right being standard threaded ('righty tighty').
https://www.condorcycles.com/blogs/journal/36344385-how-to-remove-pedals
Depending on pedals you'll need a 'pedal wrench', but some more modern pedals can only be tightened using an allen key on the spindle (Keo's). Some will take both/either (most Shimano). Most basic/flat pedals only work with a wrench.
12,357km for me at the moment.
That's nearly 7700 miles! Massive kudos! One of the biggest here?!
I weighed myself this morning for the first time in ages. I thought it would be bad news, given it's winter so I'm eating everything and have cut back on cycling, but somehow I've got down to 69kg. Not bad.
Last 'official' day here too, finish at lunchtime and then the company has hired a fish & chip van for the staff. Quite disappointed there's no turkey.
Actually gotta come in briefly tomorrow for some security guy, arranged for 11am so at least I can have a lie in...!
Weighed myself earlier too, 74.8kg! Considering the amount of junk I'm eating already I'm considering that my end point for 2016 and I'll be hoping to be back near it the end of January... Although I've got a week in Jamaica drinking rum and eating jerk chicken mid-month to really hamper me lol
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