With factoring it's partly about rates and partly about the breadth of services that they can offer and the fine details of the agreement. What else can they do for you and what else you need from them kinda thing.
Off the top of my head:
Invoice Payment Systems (IPS) - talk to Cheryl
JD Factors - talk to Pauline
Royal Finance - talk to Peter
Pretty sure there are a few members here in the industry, speak up now so Henry can contact you also.
Keep well,
Mike