Long time lurker but first time posting.

Not directly related to the engineering works this weekend but relates to Heathrow Express/Elizabeth Line. I quite often arrive at T5 LHR late in the evening from GLA and Elizabeth Line services only run every 30 minutes. I recently found out that if you just miss an Elizabeth Line service (e.g. 21:50) you can get on the next Heathrow Express service (e.g. 21:57) to T2&3 (arriving 22:02). There is then another Elizabeth Line service from T4 from T2&3 5 minutes later (e.g. 22:07). I post about this very boring fact because this route with a 'connection' at T2&3 is never listed/advertised on Trainline or Citymapper. I hope this post saves someone paying for the extortionate Heathrow Express or 20mins waiting for the next Elizabeth Line service in the future.