It is vital that you give your conveyancer time to do their job properly regardless of your developer's 28 day deadline to exchange.
Consider what happens on resale, your property value and the huge investment you are making.
The property is also security for your lender who must be satisfied.
How do you repay your lender if the property is worth less than the mortgage advance?
Surely doing it properly is more important than doing it quickly.
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