Colin and Sheila,
Further to your post, most birders will agree that twitching Great Grey Shrikes can be a very frustrating experience. Some GGS are locality tourists, ranging far and wide over a given territory such as the Rauceby Warren 1986-1991 bird(s); others seem more locality loyalists frequenting a favoured but limited stretch of hedgerow, woodland edge, etc. ........and, of course, just to make it even more frustrating for us, some start in one group and then move to the other; some are loyalists in the morning but tourists in the afternoon; and yet others simply 'disappear' within a couple of days or so. .......hence the experienced birder's maxim :
' If you've got something better to do and like, never twitch a Great Grey Shrike. '
The Welbourn GGS was more of a locality loyalist : I went for it 4 times during its stay and connected each time (and, importantly, only a 15 minutes' drive from BBH, so no long distance twitch involved.)
A current bird is on Muspit Lane, South Wheatley, Notts having been reported regularly for some days now along much the same stretch of hedgerow.
The current Tetney Lock (village) bird has been seen on each of these past 4 days.
The Frampton-Cut End GGS frequented much the same area before it moved away but the Brothertoft bird didn't show today after yesterday's (first) report.
If it stays around, it will be interesting to discover which daily routine the Kelby-Rauceby bird adopts, although to date it has been reported on 2 successive days only a few hundred yards apart.
I suppose the one crumb of comfort you achieved from today's trip was that you didn't have far to drive home after dipping out; more a case really of having checked out the local area rather than a twitch.
Freddy