It appears there are some issues with this template on PHP newer then 7.0. If I go up to PHP 7.1, I get this error log:

PHP Code:
[18-Jan-2020 07:20:59 Australia/Sydney] Request URI: /, IP address: 173.183.94.130
#1  require(/***/includes/templates/westminster_new/common/tpl_main_page.php) called at [/***/index.php:97]
--> PHP Warning: A non-numeric value encountered in /***/includes/templates/westminster_new/common/tpl_main_page.php on line 74. 
If I go up to PHP 7.3, I get this error log:

PHP Code:
[18-Jan-2020 07:22:54 Australia/Sydney] Request URI: /, IP address: 173.183.94.130
#1  require(/***/includes/templates/westminster_new/common/tpl_main_page.php) called at [/***/index.php:97]
--> PHP Warning: Use of undefined constant SET_COLUMN_LEFT_LAYOUT - assumed 'SET_COLUMN_LEFT_LAYOUT' (this will throw an Error in a future version of PHP) in /***/includes/templates/westminster_new/common/tpl_main_page.php on line 69.

[18-Jan-2020 07:22:54 Australia/Sydney] Request URI: /, IP address: 173.183.94.130
#1  require(/***/includes/templates/westminster_new/common/tpl_main_page.php) called at [/***/index.php:97]
--> PHP Warning: Use of undefined constant SET_COLUMN_CENTER_LAYOUT - assumed 'SET_COLUMN_CENTER_LAYOUT' (this will throw an Error in a future version of PHP) in /***/includes/templates/westminster_new/common/tpl_main_page.php on line 74.

[18-Jan-2020 07:22:54 Australia/Sydney] Request URI: /, IP address: 173.183.94.130
#1  require(/***/includes/templates/westminster_new/common/tpl_main_page.php) called at [/***/index.php:97]
--> PHP Warning: Use of undefined constant SET_COLUMN_RIGHT_LAYOUT - assumed 'SET_COLUMN_RIGHT_LAYOUT' (this will throw an Error in a future version of PHP) in /***/includes/templates/westminster_new/common/tpl_main_page.php on line 74.

[18-Jan-2020 07:22:54 Australia/Sydney] Request URI: /, IP address: 173.183.94.130
#1  require(/***/includes/templates/westminster_new/common/tpl_main_page.php) called at [/***/index.php:97]
--> PHP Warning: A non-numeric value encountered in /***/includes/templates/westminster_new/common/tpl_main_page.php on line 74. 
This is a fresh install on 1.5.6c.