I am fairly sure there wasn't when I was at school - I did some research and came across the following quotes if you google 'The acquisition of handwriting
in the UK - Tom Davis' you will find it - it is about the period I would have been at primary school 1981-1992. I do think I would remember maybe not the early years but if there was any concept of pen licences or similar and there being a standard for joined up writing as we called it.

In general what the project showed was this. Handwriting of UK citizens is, compared with that of those educated elsewhere in Europe or in America, very various. No uniformity is imposed centrally, at the governmental level, or locally, by Local Educational Authorities. There are several different handwriting systems to be found in the available copybooks, and each copybook may present its own version of the system it derives from. Individual schools may favour particular systems or particular copybooks, but often it is left to the individual teacher of handwriting to adopt whatever method they feel comfortable with.
this means is that diversity, rather than uniformity, is the rule. Diversity is also encouraged by modern theories of child-centred education, and by the belief that the style should be adapted to the individual child's abilities rather than that each child, whatever his or her skills, should aim to imitate the perfection of the model writing. Here even in our small sample practice varied considerably, from one end of the spectrum to another, but it is clear at least that diversity is to be expected rather than conformity. And the relative autonomy of the schools from the prescriptions of the LEA's further reinforces this general picture.
Things may well have changed now - my generation were taught very little about grammar and sentence construction, but things have swung the other way now (I think a lack of understanding about the structure of the English language is a barrier to learning other languages - so is good that the structure of the English language is being covered a little more now).