From the Barclays page about Community Accounts:
"[Q] What does the account offer?
[A] > Free everyday banking for as long as you continue to meet our eligibility criteria
> Authorise up to three individuals as signatories on the account
>
Access to our free, best-in-class Online Banking and mobile banking services
> Up to six debit cards and a cheque book"
So it wuold seem to be posible to use online banking with such an account (but I don't know how it would work).
https://www.barclays.co.uk/business-banking/accounts/community-account/#eligible