What's the going rate for the tooth fairy these days?

My son ruined the tooth fairy for himself after kicking off due to only getting a quid for his long awaited first tooth. He'd been wobbling this tooth for months, cue much discussion between me and his Dad to how much we were willing to give per tooth. I was happy with £2 but my husband would not budge from £1 after doing the maths and only being willing to spend £20 for his whole mouth! (Husband is a tight git, but I was willing to give him this decision). Anyway, said tooth fell out. Now, I'm normally a bit crap with the whole children's magic stuff. For context, Santa is very much The Christmas Postman and doesn't get over hyped and those fucking elves aren't allowed on our property! But I felt the need to make the tooth fairy a little special, so I wrote a lovely poem about his tooth and how special it was because it was shiny and white and well looked after. Wrapped the £1 in the poem and snuck it under his pillow. Went to bed feeling smug that I'd finally managed to win at this childhood magic game. Fast forward to dawn and the sound of wailing wakes me from my slumber. Son runs in with the £1 in his fist, tears streaming down his face. "Whatever is the matter?" I say. "The tooth fairy left me a pound" he replies. "Wow that's brilliant!" I utter, "Did she leave you anything else?" "Just this letter, but what's that going to get me? A pound won't buy me anything these days and my friends have had £5 and their teeth are rotten! My teeth are perfect and I've only got a pound! What was the point in cleaning them if rotten teeth get paid more?!" At this point we're on full-on snot-ageddon, he's woke his brother and the dog is whining at the stair gate! I realise the little bugger has a point here. His teeth are perfect, he's worked hard, it's not his fault his mates are richer (or have daft parents). So I take a deep breath and say, "Alright mate. Do you want to know a grown up secret? One that you can't tell your mates, your cousin or your little brother?" He sniffs, his interest is peaked, he nods. "The tooth fairy is (drumroll) .....Me! I'm the tooth fairy. I wrote you that beautiful letter and left you a pound coin because I love you so much and wanted it to be special..I'm sorry it wasn't a fiver, but we're not super rich and I thought you could buy some football cards with a pound" Immediately the lad stopped crying, gave me a hug and said, "That's ok then Mum. I promise I won't tell my brother!" Honestly, kids are weird! Next stop...Easter Bunny!!!