Bike Hand YC-112, cuts everything including odd shaped aero seat posts. Indispensable. Great tool, half the price of the pale shadow Park.
Reminds me of one of the best tools I ever bought, a portable bandsaw. Some call 'em Portaband, but that's a brand name, and I bough a different brand. Anyway, I almost never hacksaw anything anymore. I have it attached to an aftermarket table that turns it into a little vertical bandsaw. With the table screwed down to the bench it lives on, I can use both hands to guide the part into the blade. Pro tip, get a foot-pedal on-off switch, the "dead man" kind where you have to keep pressing down, or it stops. Convenient and a good safety feature.
Between the 'portaband' and the table, it's one of the more expensive tools (though I did get the bandsaw used). Lotsa guys have made their own table, either the kind you screw to the table, or one that you clamp in a bench vise to use, but I was lazy, and feeling flush I guess, so I just bought the table. This one, for clamping in a vise, shows how you could make your own fairly easily:
https://www.swagoffroad.com/products/swag-v1-0-portaband-table. Most of us can't bend that thick a steel plate, but it could be made by drilling and bolting pieces together.
If you want to buy one, apologies if that SWAG item prohibitively expensive to ship — I'm 'Stateside' — but maybe there's an equivalent made in UK.
Just the bandsaw (no table) can be super useful too, just wielding it in your hands. They make 'em in cordless, battery-powered also, but corded is more powerful and less expensive, fine if it's mostly going to be anchored to the bench or vise.
If I'm just shortening an M6 bolt or some such, I'll still hacksaw, but anything larger, why risk a repetitive-strain injury?