If you're looking in Alberta (Calgary, Edmonton),
External Link/Members Only is probably one of the best sites (there are sections for other provinces but not used much). It has ad sections for independents and agencies which are well regarded, as well as review section that is quite extensive.
Might need to use a VPN if browsing from abroad, but should be accessible from UK.
Another site that is more like searching through the weeds is leolist.cc