Map Doesn't Show on Node page

I've checked the display fields to make sure the gmap view is set to 'Default' and I've got contemplate installed, but made sure that it's reset for this CCK and there's no template for this CCK in the theme folder. The map seems to fill the node page with the dimensions that I set in Manage Fields, but the map doesn't show

http://www.wildaboutbritain.co.uk/maptest2

Source code is showing:

<div class="field-label-inline-first">Google Map:&nbsp;</div><div id="gmap-gmap_8231_field_map_gmap-gmap1" style="width: 500px; height: 400px;" class="gmap-control gmap-gmapgmap gmap-map gmap-gmap_8231_field_map_gmap-gmap"></div><script type="text/javascript">
/* <![CDATA[ */
Drupal.extend({ settings: { "gmap": { "gmap_8231_field_map_gmap": { "width": "500px", "height": "400px", "zoom": 10, "controltype": "Small", "align": "None", "maptype": "Map", "line_colors": [ "#00cc00", "#ff0000", "#0000ff" ], "behavior": { "locpick": false, "nodrag": 0, "nokeyboard": 0, "nomousezoom": 0, "autozoom": 0, "dynmarkers": 0, "overview": 0, "notype": 0, "collapsehack": 0, "scale": 0, "fatmarkers": false }, "markermode": "1", "field_name": "field_map_gmap", "type": "gmap_cck", "required": "0", "multiple": "0", "db_storage": "1", "alignment": "Center", "gpx": null, "gpx_src": null, "marker_noderef": "marker", "widget": { "type": "gmap_cck", "weight": "0", "label": "Google Map", "description": "" }, "type_name": "map", "display_settings": { "label": { "format": "inline" }, "teaser": { "format": "default" }, "full": { "format": "default" } }, "markers": [ { "label": "maptest2", "opts": { "title": "maptest2" }, "latitude": "51.739865", "longitude": "-3.363518", "markername": "drupal", "text": "\x3cdiv class=\"gmapnodelabel gmapnodelabel-map\"\x3e\x3cdiv class=\"node\"\x3e       \x3ch2\x3e\x3ca href=\"/maptest2\" title=\"maptest2\"\x3emaptest2\x3c/a\x3e\x3c/h2\x3e       \x3cdiv class=\"info\"\x3eSubmitted by \x3ca href=\"/user/stuartdh\" title=\"View user profile.\"\x3eStuartDH\x3c/a\x3e on Wed, 02/01/2008 - 16:34.\x3c/div\x3e   \x3cdiv class=\"content\"\x3e   maptest2  \x3c/div\x3e \x3c/div\x3e \x3c/div\x3e" } ], "id": "gmap_8231_field_map_gmap", "querypath": "http://www.wildaboutbritain.co.uk/map/query", "longitude": "-3.4222412109375", "latitude": "52.19245608825017" } } } });
/* ]]> */
</script>

Looks like it was probably because I hadn't got the box checked for the GMAP filter in the site's Input Formats