A swirler assembly, comprising: a swirler body defining an axial direction and having a plurality of primary swirler inlets extending through the swirler body to a radially inner swirler surface of the swirler body, the swirler body being configured to swirl airflow and provide the swirled airflow into a combustion chamber; and a guide plate (204; 304; 404; 504) comprising a guide plate flange configured for engagement with the swirler body, the guide plate (204; 304; 404; 504) comprising a guide plate opening (230; 330; 430; 530) configured to receive a nozzle end of a fuel nozzle, the guide plate comprising a forward surface axially opposite an aft surface of the guide plate flange, the guide plate including a first plurality of purge holes (250; 350; 450; 550) extending through the guide plate flange and configured to introduce a first vectored purge flow into the swirler body; wherein the swirler body comprises a forward swirler body portion located axially opposite an aft swirler body portion, between which a swirler opening extends, the swirler opening extending along an axial length of the swirler body, the forward swirler body portion defining an annular wall portion, wherein the swirler body comprises a forward swirler body face (220; 320; 420; 520) that is positioned axially inward of the forward swirler body portion, wherein the axially inward position provides for a swirler body recession that extends circumferentially around the forward swirler body face (220; 320, 420; 520) and is configured to at least partially receive the aft surface of the guide plate flange; wherein the forward swirler body face (220; 320; 420; 520) is part of a retainer body (221; 321; 421; 521); wherein the aft surface is configured to couple to or interface with the forward swirler body face (220; 320, 420; 520) of the retainer body (221; 321; 421; 521); characterised by the guide plate including a guide plate collar having a forward protrusion and an aft protrusion, wherein the forward protrusion is located on the forward surface and extends in an axial direction away from the forward surface of the guide plate, the forward protrusion defining a forward circumferential boundary for the guide plate opening, wherein the aft protrusion is located on the aft surface and extends in an axial direction away from the aft surface of the guide plate, the aft protrusion defining an aft circumferential boundary for the guide plate opening. a swirler body defining an axial direction and having a plurality of primary swirler inlets extending through the swirler body to a radially inner swirler surface of the swirler body, the swirler body being configured to swirl airflow and provide the swirled airflow into a combustion chamber; and a guide plate (204; 304; 404; 504) comprising a guide plate flange configured for engagement with the swirler body, the guide plate (204; 304; 404; 504) comprising a guide plate opening (230; 330; 430; 530) configured to receive a nozzle end of a fuel nozzle, the guide plate comprising a forward surface axially opposite an aft surface of the guide plate flange, the guide plate including a first plurality of purge holes (250; 350; 450; 550) extending through the guide plate flange and configured to introduce a first vectored purge flow into the swirler body; wherein the swirler body comprises a forward swirler body portion located axially opposite an aft swirler body portion, between which a swirler opening extends, the swirler opening extending along an axial length of the swirler body, the forward swirler body portion defining an annular wall portion, wherein the swirler body comprises a forward swirler body face (220; 320; 420; 520) that is positioned axially inward of the forward swirler body portion, wherein the axially inward position provides for a swirler body recession that extends circumferentially around the forward swirler body face (220; 320, 420; 520) and is configured to at least partially receive the aft surface of the guide plate flange; wherein the forward swirler body face (220; 320; 420; 520) is part of a retainer body (221; 321; 421; 521); wherein the aft surface is configured to couple to or interface with the forward swirler body face (220; 320, 420; 520) of the retainer body (221; 321; 421; 521); characterised by the guide plate including a guide plate collar having a forward protrusion and an aft protrusion, wherein the forward protrusion is located on the forward surface and extends in an axial direction away from the forward surface of the guide plate, the forward protrusion defining a forward circumferential boundary for the guide plate opening, wherein the aft protrusion is located on the aft surface and extends in an axial direction away from the aft surface of the guide plate, the aft protrusion defining an aft circumferential boundary for the guide plate opening.