VQOTW: MTD AND CASH ACCOUNTING

My client is a wedding and party planner, and is compulsorily VAT registered operating the cash accounting scheme. Their current system is not particularly sophisticated and they only operate using a manual cashbook. I am in the process of ensuring they are MTD compliant for their 07/19 return, but want to keep things as simple as possible for them. Can they continue to operate a cashbook in a spreadsheet format and submit via bridging software?