My aim yesterday was to travel on one... And I succeeded
From what others on here told me and from what I saw, the 0748 Paddington to Cheltenham Spa is your best bet. Yesterday, it actaully started from one of the bay platforms at Reading and we were told to catch the 0745 train (Swansea one) and change at Reading. Quite handy the 180s only being 5 cars... Couldn't have got a HST▸ (High Speed Train) into the bay platform (I don't think so anyway ). Anyway, one of my friends is also a FGW▸ (First Great Western) drivers and he said that apparently FGW are now keeping 3 Adelantes.
I'm glad I've travelled on one. They are not that special to be honest, but nice to go on a DMU▸ (Diesel Multiple Unit) that can go at those speeds and makes a difference to a HST... And nice to be on a train and hear the roar of the engine as she powers up ! I wish we had DMUs on FCC▸ (First Capital Connect) on the Great Northern