Concatenate not equivalent to merge.

[pp-mo]

Stumbled over a case with files containing data at different timepoints. Each file gives a 1 time dimension (owing to netcdf representation) : Making the time coordinates *scalar allows these all to merge correctly. However, the original data will not concatenate (which ought to be an equivalent operation).
Not yet found what may be causing this.

N.B. example data, but unfortunately large, attached to internal issue : EPM-691
TODO: chase this up + produce testcase with small data.

[ajdawson]

Just had an issue on Google Groups that exhibited this symptom (https://groups.google.com/forum/?fromgroups#!topic/scitools-iris/LWXXvObs-mw). Looks like it was fixed in v1.7.3 though. Are you able to check if this is still an issue on v1.7.4 or v1.8.1 @pp-mo?

[pelson]

I'll close this as it wasn't really reproducible. I've taken a look at @pp-mo's referenced (internal) ticket, and even there, the data moved mid investigation (hence the problem with isolation I believe).

Thanks @ajdawson!