I don't live in the UK.
DS had only the obligatory vaccinations, I refused all others including the MMR. Based on catching the panic online mostly. It wasn't a "researched" decision (despite all my fervent claims that it was). It was basically a few cherry picked scources that confirmed my "I don't like needles being jabbed in my baby" bias and lots of reacting to headlines like "Tony doesn't vaccinate Leo!!" (sub text "he knows secrets that we don't!!!!!!")
Some time later, as I was planning a trip back home to England, I started seeing reports of measles outbreaks. Looked into measles. Got very freaked out. Decided I was more afraid of the known risks of measles than the more disputed claimed risks of vaccination. Took him to the clinic and cried all over the vaccination nurses. Who were lovely and got him caught up on missed jabs. So I eventually went home feeling confident he wasn't going to catch anything horrible. And he didn't.
It was something of a turning point and got me questioning how I left myself so wide open to my previous position. I went on to belatedly discover the scientific method, logical fallacies, the Dunning-Kruger effect (and more recently the backfire effect). Actually looked into vaccinations in a less emotionally orientated manner, with much less cherry picking and a lot more trying to keep my biases in check. Felt rather relieved that my earlier position only had the (livable with) negative consequence of feeling like a twerp.
My baby is almost 17 now and has just had another round of jabs, including the new triple meningitis vaccination. So he is all up to date even with the newer ones offered by the state. I stay at home on vaccination days, DH goes. I am still crap with needles being jabbed in my "baby".
DS has never caught anything he could have been vaccinated against, including chicken pox. So at this point I am going to cough up for the varicella vaccination that has more recently been made available privately.
I regret my earlier reaction. A lot.
Not just in terms of vaccinations. My mindset about jabs spilled over more generally too. With a less "emotions led" approach I would have left myself exposed to fewer "OMG everybody panic!" scources relating to various aspects of surviving early parenthood.
I could have taken more nuanced, less black and white views of the myriad of ways one can bring up a baby safe and sound. I could have spent a lot less time arguing to the death online about parental choices that in the grand scheme of things make little to no difference.
I think my post baby mental health would have been a lot better as a result with a more considered, less emotionally reactive start point I could have done with feeling more in control, better placed to make reasonably informed judgement rather than snap decisions and been decidedly less overwrought when in the midst of getting to grips with motherhood.
I kind of made an already difficult transition from "no kids" to "have kid" a lot more difficult than it needed to be.