By Charlie Conchie A number of the government’s flagship City reform efforts including the roll-out of the British ISA and so-called Pisces private market have been thrown into doubt by Rishi Sunak’s gamble to hold an early election in July. Ministers have been pushing ahead with a slew of changes to City policy over the past two years, but consultations on some of the landmark plans now risk being kicked into the long grass as both parties shift into election mode. Treasury sources confirmed yesterday that the government has already shelved the much-touted retail sale of its stake in Natwest,…