A contract will be substantially performed in advance of
completion where the purchaser has paid substantially all of the
consideration specified in the contract.
In deciding whether or not a substantial amount of the
consideration has been paid or provided, regard needs to be had to
whether the rent represents the whole or part of the consideration.
If
Substantially the whole means an amount equal to or greater than
90 per cent of the total consideration due under the contract
unless the circumstances of the transaction are such that in
substance the whole of the consideration has been paid or provided.
Such a case might be an arrangement where a contract dated
January 2004 provides for the purchase of a property with a market
value of £10m and provides for payment of £15m with
£10m payable now and the balance in 2099.