Can an IFISA be held with more than one provider?

Yes, but it is more complex due to the ‘one of each type’ rule. There are three ways to open more than one IF ISA:

Every tax year the IF ISA provider can be changed so there are multiple IF ISAs with multiple providers. This requires opening a new IF ISA each year with different providers.
Investors can transfer funds between ISA managers. This is especially useful if there are funds subscribed to ISAs in previous years that investors want to invest in direct lending. Investors can transfer funds to more than one IF ISA provider. Initially, HMRC drafted the regulations so that only direct lending providers could be IFISA managers. Goji successfully campaigned to change these rules though so that third party ISA managers, such as investment platforms and Goji, could be ISA managers and enable investors to diversify their ISAs.