No visible filling loop

Hi all, My boiler pressure has gone below 1 so it's not working and I now have no heating or hot water. I have watched a few youtube vids which mention re-pressuring the boiler with two blue values on the bottom of the boiler. Mine has none. Anyone know how I can sort this? Seems like a simple job but of course, not for me! I can't attach images but there is no visible filling loop. No grey threaded loop of any sort on the outside. I am using a BAXI Duo-TEC COMBI 28. I have checked under the sink and near the stop lock. Nothing. No loop. I do have a Magnaclean filter attached to the boiler but turning those on and off makes no difference.