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.

The rules are that you can only open one cash and one stocks & shares ISA in each financial year.

http://www.hmrc.gov.uk/ISA/rule-change-april08.htm