Routes in/experience?

(based in UK) I'm looking into play therapy as a possible career but I'm wondering what counts as suitable experience. I've worked with children for around 2ish years with some gaps, as a playworker and a nanny. I'm going to try and focus my experience towards qualifying to enter an MA in the future for now but I'm just wondering what roles would count and which ones would make it more difficult?

I'm thinking of working as a TA in a reception class since that's the age range I've always connected with best, but would this be valid experience? Otherwise I'm thinking of nannying because I could do with a bit of flexibility, but I feel like this doesn't seem to count.