Hank
did produce a 1978 Des O'Connor LP: "Another Side":
Pye (UK) (1978); NSPL 18559 (stereo)
1. I Can't Help Myself
2. Silver Lady
3. Almost Like A Song
4. Feel The Warm
5. Goodtime Charlie
6. Massachusetts Turnpike
1. Chicago
2. Sam
3. I Can't Smile Without You
4. There She Goes Again
5. It Doesn't Matter Anymore
6. Midnight Blue
Never released on a CD as far as I know, but often available in bargain bins for £1 or so (that's how I got mine).
The number - NSPL 18559 - was in sequence with various other LPs from the same period (of course).
For instance, ten numbers previously, NSPL 18549 (Joe Dolan), is also a 1978 release, whereas NSPL 18537 (Brotherhood of Man) was a 1977 release.
NSPL 18595 (Rex Harrison) was also a 1978 release, but NSPL 18602 (George Melly) is listed as a 1979 issue.
The list from which I am quoting
https://secondhandsongs.com/label/276 - is incomplete, but it looks as though Pye may have issued about fifty LPs in 1978 in the NSPL series, starting with a number around 18549 and running up to about 18600.
The Des O'Connor album falls about one-fifth of the way through that and (assuming a spread of releases throughout the year) may have been issued in about March 1978.
If that is the case (it's just a calculation from a limited amount of data), it isn't likely that it was recorded in early 1978. 1977 is more probable.