Investors & landlords

I'm hoping you can help me with a quick follow-up question. Our tax adviser in the UK is insisting that we have to file form 8858, saying that we keep separate books and records because we compile a spreadsheet at tax time from our monthly rental statements that our property manager provides. If we do as he says, do you know if there are any adverse tax consequences for us, either now or possibly in the future? Thank you.