Through Heritage Financial Services, you can invest in a wide range of Mini & Maxi ISA funds from over 50 of the UK 's leading fund providers - displayed to the right of this screen. You can either subscribe a single lump sum payable by credit/debit card, or by cheque, or set-up a direct debit to save on a monthly basis. You will automatically receive the full discounted ISA rates plus any ISA promotions offered by each individual fund manager.