Churchill has joined Budget Insurance's broker panel to offer motor and home policies, effective from 8 May.
Churchill business development director David Hiddleston said the deal had been discussed for some months and was part of the company's on-going plan "to roll out our rates on to larger broker panels".
The system will be full cycle electronic data interchange (EDI) and both group's will be seeking more claims staff.
Churchill has targeted about 20 brokers for motor and home policies and hopes to extend this to the travel market, he said.
Churchill has similar deals with KwikFit, Swinton, Hill House Hammond and BDML.
Hiddleston also confirmed Churchill would sell its products through NIG's broker network from July.