Just wanted to say thanks to the above guys and girls, this worked a treat!
added extra field in admin with Service Name 'tank_mates' and a default value of 'no' and put the code below in product.tpl
{section name=field loop=$extra_fields}
{if $extra_fields[field].service_name eq "tank_mates" && $extra_fields[field].field_value eq "yes"}
<div id="layer1"{if $active_set ne 1} style="display:none;"{/if}>
{if $active_modules.Upselling_Products}
{include file="modules/Upselling_Products/related_products.tpl" }
{/if}
</div>
{/if}
{/section}
Hope that and the above helps anybody else trying to figure this out
