Tenant in arrears before coronavirus hits!

Tenants of over 3 years have always been unreliable payers. Not paid rent on time since December, other than a few hundred here and there to keep under the two months rent arrears threshold. Rent is £795 and currently £1455 in arrears before effects of coronavirus hits. Was going to issue section 8 for regularly late payments (over 10 payments more than 2 weeks late during tenancy) but now can’t! I want to be decent as they have a young family but we have service charges/ground rent of £2000 a year to pay out and need this money!

Any thoughts?