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Clamp a straight edge such as a long spirit level to the door with two clamps, at the required distance from your cut line to allow your circular saw to run along it nice and straight. And buy a decent, high tooth count, circular saw blade for nice smooth cuts.
No outlay on spenny new tools, upgrade of your existing circular saw, win win...?
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I did a lot of research on this and the answer was the MacAllister 1200W they sell in B&Q
https://www.diy.com/departments/mac-allister-1200w-220-240v-165mm-corded-plunge-saw-msps1200/3663602797579_BQ.prdI got one from eBay for £77. The thing with plunge saws is however great they are, there's not much point if they don't run on decent track, and the MacAllister is Makita/Makita-style compatible. Whereas DeWalt (for example) make good saws but only fit their own weird track.
I've heard good things about the Rutland ones (and IIRC they're Makita compatible) but they are £180 and I wasn't convinced they were much better. If you want to watch some YouTube reviews Peter Millard is the man.
Freud blade pls or you'll make @dbr cry.
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Seconding Fox's B&Q MacAlister recommendation, had one for a couple of years and it's done a solid job.
Would really recommend a pair of clamps that fit the rails as well, makes it much more comfortable cutting straight IMO, something like this
I need to cut a bunch of internal doors to size. So, I think I need a track/plunge saw - my circular saw cuts are never straight :/
I really don't want to be spending GC money though. Any recommendations?