Dear jmeasy
Virtually all insurers offer payment by direct debit, varying from 9 to 12 instalments. Be careful of APRs, (which are interest rates charged by insurers for allowing you to pay by instalments, as opposed to paying all at once).
The average APR is 23.5%. Saga, Direct Line and Virgin offer interest free instalments but some insurers charge over 30% APR, such as Kwik Fit, which may not be cost effective.