If you are doing this for career purposes rather than 'fun' then take the ATPL exams (where there are more suppliers, so the costs are 'quite competitive') then complete the IR within 3 years (which you would do if this is for career purposes).
Else you have to sit the instrument papers again (which would cost you an unplanned £1800+VAT or so).
Some of the CPL ground courses are as expensive as the ATPL ground course but with less content. The extra cost is then in the extra papers you sit (but thats good for the soul).
h-r
