Originally Posted by
corporate-wage-slave
Just for future reference, there is in the forum's Dashboard, a very detailed guide to transferring between LGW and LHR, and all the options. Anything over 3 hours between flights is fine, and if HBO you could do it more quickly than that, however Minimum Connection Time is 3 hours.
The HBO aspect is pertinent. However, with hold bags, or foreign passports, a large slice of MCT is involved in getting across the UK Border, recovering bags and re-dropping them at the next airport. The simple 1-hour bus journey [taken at the right time of day] is but a part of the MCT equation ... add in late arrival of the inbound aircraft and things can get quite exciting.