No problem at all.
I spot people all the time now over pronating!! I'd never even heard of it before. It's basically when your ankles and consequently your knees and hip rotate inwards which then pulls on your lower back. It's painful, and I would recommend yoga stretches and walking afterwards to gently ease everything back to normal again.
I find sketchers really good for my feet now as they have memory foam soles, heals are a dim and distant memory.
Orthotics will initially feel uncomfortable under foot until your body gets used to them, and you should wear them for longer increments each day. You must then wear them all the time even in slippers. Mine were about £45 each, which is expensive, but they were worth it.
You will probably need to wear lace up shoes too as the orthotics raise up the height of your feet in footwear and you don't want the tops of your feet to start rubbing. Unfortunately it might mean donating some shoes to charity shops.
I just went to a local podiatrist, I didn't need a referral. Your NHS one might be better than mine and you can go in knowing a bit more about it.
Best wishes c