maxsteam:

Jalexa:

Don't think that's right. The maturing fixed rate ISA must be previous year(s) funds. Can be transferred in whole or in part to any number of providers which accepts transfers.

Yes, but the product that the funds are transferred to can't be a new cash ISA that is opened this year. Hattie has already opened one new cash ISA this year so she can't open another. The funds may be left where they are.

OK, but there is unnecessary focus here on "opening". You are right about that but what the OP is wanting to do is to transfer previous years ISA funding to a different provider. To do that the OP needs to find a provider(s) which will accept transfer of previous years ISA finds. The new provider(s) will arrange the transfer(s).

That is not considered "opening".