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Assuming the first answer breaks the exponentiation rule, here's a second.
Source Link

BBC BASIC 2

7 bytes

P.2^127

Result

1.70141181E38

BBC BASIC

As commented the previous answer may violate the exponation rule, so here's something using the EXP (exponent) function instead.

P.EXP(88)

which returns

1.65163622E38

BBC BASIC 2

BBC BASIC 2

7 bytes

P.2^127

Result

1.70141181E38

BBC BASIC

BBC BASIC 2

7 bytes

P.2^127

Result

1.70141181E38

BBC BASIC

As commented the previous answer may violate the exponation rule, so here's something using the EXP (exponent) function instead.

P.EXP(88)

which returns

1.65163622E38

BBC BASIC 2

Source Link

BBC BASIC 2

7 bytes

P.2^127

Result

1.70141181E38

BBC BASIC