Did I see Shuttle and ISS flares?

Wasn't it justbeats who wrote:
http://www.heavens-above.com/ should answer all your questions.
Excellent site for tracking (or checking) ISS and Iridium timings...

Heavens Above doesn't give any (daytime) Iridium flares for South
Lincolnshire at that time.

You can't use Heavens Above to check for daytime STS passes, because it
only lists visible passes, and it thinks it only gets dark enough to see
satellites at about 9:15pm. You can check for ISS daytime passes because
ISS is included in the "Radio Amateur Satellites". There were none at
that time.

I, necessarily, had to use an approximate location for South
Lincolnshire. It's just about possible that you might get different
results if you enter your precise location details.

Note that many other satellites can flare. Iridium flares tend to be the
main ones that get mentioned because their orientation is precisely
predictable which allows flare forecasts to be made for them.

--
Mike Williams
Gentleman of Leisure