We are happy to consider delayed physical connections if you have reasons to require this, but please remember that it is a requirement of the government voucher scheme that you order service delivery for a period of 12 months in order to benefit from the £3,500 business or £1,500 residential voucher.
Should you delay installation, this may well put your voucher application at risk. In any event, the current voucher scheme will end in Spring 2021, so don't delay too much!