Another point to remember with baler twine is, its best to use thin stuff off small bales of hay or straw, the big round bales have extra thick twine that doesn't break as easy

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Kay, Betty & Beryl

Valid point But may I just say.. Ive had horses all my life sold up last year. The chestnut mare in the pics was a nightmare for breaking free in the five years I owned her.. I had her from a 3/4 year old and i could have the thinist piece of balin twine on her and she could still pull the a panel off the side of my mates horse box (that was a shocker I told my mates hubby don't get my horse out Im going the loo when i come back i can unload..lol, i got back and he had got her out and tied her to her to the string and her haynet was tied to it aswell.. Next thing she was cantering across the field with a haynet trailing with her..lol) luckily never hard to catch ..she pulled a fence down on christmas day.. her door off its hinges.. I'd go a show work in and do my class then throw her in back in the box... hahah

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hahah i also live in spain but had horses in england and some of the things i do they think are crazy!! have you tried riding the silla vaquera i have with bad results much too wide for me and my short legs

Or a very unstable fence my friend did that, one minuet there was a horse and a fence the next there was a horse attached to a little white fence cantering off down the field! lol

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The idea of tying the horse with a lead rope attached to a head collar to a piece of string attached to a hook is that if the horse decides to rear up or do anything else erratic, the string breaks and leaves the horse free to move away. Using typically baling twine is questionable since if double looped it is pretty strong whereas using traditional string made of natural fibres can mean that the string gives way too easily.

However there are disadvantages in this system:

A typical lead rein tied onto twine/string does not free up as easily as it would if tied directly on to the hook. So even the use of a quick release
knot on the lead rope does not help in cases of emergency.

Secondly a frightened loose horse can be dangerous to humans or other horses standing close by.

Personally, on my own horse, I prefer to use a lead rope which has a quick release catch at both ends - one end is attached to the head collar - the other to the ring bolted into a wall or secure timber framing.
Surprisingly such lead ropes are not readily available. But I know my horse and I expect her to behave in a particular fashion.

I try to teach her to stand still untethered for many routine scenarios - but I have the luxory of being able to do this. Western riders routinely teach their horses to stand if the reins are dropped to the ground - but that practice is a different mind set - perhaps not to be followed in the UK,

This issue is like many issues in the world of horses, everyone has their own preference but in this case the majority seem to favour the use of string which will break in an emergency.

I would suggest you use the string (as against baling twine) - especially if that is the system the other horse handlers follow.