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my @data;
open(DATA, $file) || die "Can't open $file: $!\n";
while (<DATA>) {
  push @data, [split /\t/];
}

my $town = 'London';
my ($lat, $long);
...
  ($lat, $long) = ($_->[1], $_->[2]);
  last;
}

my %data;
open(DATA, $file) || die "Can't open $file: $!\n";
...
  my ($town, @vals) = split(/\t/);
  $data{$town} = \@vals;
}

my ($lat, $long) = @{$data{$town}};