Correct way of Putting a whole dynamic page into an If Statement

I am trying to generate different page results on a dynamic page depending on whether the page is either Niche 1 or Niche 2 for Insurance Providers (these are review pages and one is Travel (Niche 1) and the other is Pet (Niche 2).

I have created a simple statement and I can get the output to print either statement depending on whether that Insurer is Travel or Pet, so that bit works

<?php 
if ($broker_details->Niche_NicheID== '1'){
echo 'THIS IS NICHE 1';
} else {
    echo 'THIS IS NOT NICHE 1'
    ;}
    ?> 

It will print correctly

THIS IS NICHE 1 or THIS IS NOT NICHE 1

But when I try to put the whole page in, the layout is showing a coding error, I am simply cutting and pasting this entire block of code between the ' ' brackets instead of the 'THIS IS NICHE 1'.

The error is right at the start so I must be putting a bracket or apostrophe or something in the wrong place.

This is at the Start of the code I want t insert

This is at the end of the code I want to insert.

I've tried putting the code in ' ' and this just turns all the divs to red, can anyone help, how should I enclose the page code correctly.

Thank you