Flying MAD-LHR and looking to book connecting flight with EI to BHD on separate booking. If flights on time, 1hr 40 between flights. As I’ll be HBO, do I need to go landslide if i’ve Checked in online though on separate bookings? Or would it be quicker to go landslide and take HEX to T2?

any insights appreciated. To book a different flight to BHD, means a 6 hour stop in LHR, flying BA.