Re: Life goes on.
I'm freelance - so if I've got an axe to grind it's against IR35, but....
There's no VAT benefit to HMRC. Whatever the contractor adds to the invoice will be reclaimed by the client.
You're also forgetting that (in this simple analysis) the client is £55k better off for not employing a contractor and will therefore pay corporation tax on that amount.
There's no legal requirement for an accountant unless your accounts have to be audited - which I would find surprising.