Never been to LHR (down from the hills) before, so wondering about the following. Going to MRU in January for my retirement holiday with my family. BA1327 connect flight from NCL leaves at 1210 arriving 1325. Then BA123 out at 1545 will we have plenty of time to get to T4 on a normal Sunday? Spending a bit of my lump sum being a devil WT+.

Thanks.