Ok, using the code below, the grid all works except for the horizontal scrolling. All the columns have been effectively' best fitted' to the grid. I know I must be causing that and it something obvious, but I just cannot see it! help!

public override void ViewDidLoad ()
        {
            base.ViewDidLoad ();
        


            // Create a new gridview
            IGGridView configGrid = new IGGridView( new RectangleF(0,0,(this.View.Bounds.Width),this.View.Bounds.Height),IGGridViewStyle.IGGridViewStyleDefault);

            // Enable flexible width so that the grid feels its parents view
            configGrid.AutoresizingMask = UIViewAutoresizing.FlexibleDimensions;

            // Enable 2way Scrolling
            //Grid.common.gridconfig.enableScrolling (true, true, configGrid);

            // Configure grid theme
            configGrid = configuretheme.themegrid(configGrid);

            // Add gridview to the current view
            this.View.Add(configGrid);

            // Sort out custom column headers
            if (common.customcolumnheaders.Count != 0) {
                configdsh = common.configureheadertitles (configdsh, common.customcolumnheaders);
            }

            // Add data to the grid
            configdsh.Data = common.griddatasource.ToArray();
            configGrid.DataSource = configdsh;

            // Attempting to override column width without the use of a delegate
            configGrid.ColumnWidth = IGColumnWidth.CreateNumericColumnWidth (200f, 200f);


            // Set the filter to always be displayed and configure the default settings
            configGrid.FilterAction = IGGridViewFilterAction.IGGridViewFilterActionImmediate;
            configdsh.FilterType = IGGridViewFilterConditionType.IGGridViewFilterConditionTypeStringContains;

            string defaultValue = common.customcolumnheaders.Values.ElementAt(0);
            configdsh.FilteringKey = defaultValue;

            // The following code is used to enable the filtering popup from the navbar button
            // Configure the popover control for the filter button.
            gridfilterpopup content = new gridfilterpopup();
            content.callinggriddsh = configdsh;
            content.callinggridcontroller = configGrid;
            content.callingcustomcolumnheaders = common.customcolumnheaders;
            filterpopover = new UIPopoverController (content);
            filterpopover.PopoverContentSize = new SizeF(320,320);

            // Configure the navigation controller for this view

            // Configure a filter button
                UIBarButtonItem filterbtn = new UIBarButtonItem (UIBarButtonSystemItem.Action);
                    filterbtn.Clicked += delegate {
                        // If the popover is already showing from the bar button item, dismiss it. Otherwise, present it.
                            if (!filterpopover.PopoverVisible)
                                filterpopover.PresentFromBarButtonItem (filterbtn, UIPopoverArrowDirection.Any, true);
                            else
                                filterpopover.Dismiss (true);
                            };
            
            this.NavigationItem.SetRightBarButtonItem (filterbtn, true);
            configGrid.ReloadInputViews ();
        }