R v Chief Constable of Merseyside, ex parte Calveley [1986]

Following
investigation, five officers dismissed from force or required to retire.
Officers
had right of appeal under Police Act 1964, which they exercised.
Before
appeal heard, they also applied for JR of decision.
Court
of Appeal held that JR would not normally be allowed where there was alt remedy
by way of appeal, save in exceptional circumstances.
Factors
to be taken into account in deciding whether circumstances were exceptional:

Speed of alternative procedure.

Whether it was as convenient.

Whether matter depended on particular or technical knowledge available to
appellate body.
In
present case JR justified.