func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

        if let datasource = flavoursDataSource {

            let cell = collectionView.cellForItem(at: indexPath) as! TasteCollectionViewCell

            let flavourGroup = datasource.priorityFlavourGroups[indexPath.section]
            let flavour = flavourGroup.groupFlavours[indexPath.row]

            let selectedFlavours = selectedGroups.flatMap({$0.groupFlavours})

            if selectedFlavours.first(where: ({ $0.flavourName == flavour.flavourName})) != nil {
                selectedGroups.first(where: ({$0.groupName == flavourGroup.groupName}))?.groupFlavours.removeAll(where: {$0.flavourName == flavour.flavourName})
                cell.deSelectCell()
            } else {
                selectedGroups.first(where: ({$0.groupName == flavourGroup.groupName}))?.groupFlavours.insert(flavour, at: 0)
                cell.selectCell()
            }
            tableView.reloadData()
        }
    }