Speech and Language Therapy Work Experience

Hi guys, first time posting on TSR and not entirely sure if I'm doing this right, so you'll have to forgive me!

I'm currently in Year 13 (Lower Sixth) at school but am in the process of trying to sort out work experience. I'm hoping to study Speech and Language Therapy at university and would like to gain some relevant experience for this when given this opportunity. However, I'm not exactly sure what "relevant experience" is. As silly as it sounds.

I have the details for a couple of local trusts and an endless amount of numbers for independent therapists and plan to ring tomorrow in the hope of being able to shadow a Speech and Language Therapist during this time. However, I am aware that this is extremely difficult to do.

So in case that fails, is there any other experience which you would recommend I try to get? Or am I doing the right thing so far?

I've researched starting a Sign Language Course and have experience in volunteering at a mental health nursing home for older people - some of whom have speech and language difficulties either because of their condition or for example, from having a stroke. My brother also has dyspraxia, which is really what got me interested in pursuing this career. But other than all of this and some other volunteering schemes I'm involved in, such as youth groups or acting as a mealtime support worker for hospital patients, I'm stumped!

So any help or advice would be greatly appreciated!
Thank you!