If it's anything like a Siemens they'll be Torx security screws, so you'll need to buy a pack of widgets from Screwfix for £5 to shift them. Then two metal tabs at the base and s/a velcro at the top.
Tonker is right, its usually the top screws at either corner and the approximately the third set down on either side, as also stated they are normally Torq headed screws
