I've worked for two days as a freelancer for a company in the UK.
They've asked me for the invoice, but I see on the internet that UK invoices require a VAT number. I don't have a VAT number as I'm unregistered and I've always worked for a company as an employee prior to freelancing.
Can I prepare the invoice without that number, as this job can be considered an incidental/once-only service? Or should I register with an umbrella company?