I don't KNOW anything but suspect you may be wrong. The records of Cattle Egret in Lincolnshire appear to be as follows (ignoring some early 20th century releases):
1986 North Hykeham, Oct 12th-26th 1992 Messingham, May 6th-10th Langham, Hogsthorpe, four, May 7th 2008 Saltfleetby, Jan 30th-31st; same Little Cawthorpe, Feb 8th-18th 2010 Donna Nook, Oct 10th to Nov 18th 2013 Tetney Lock & Thoresby Bridge, Sep 7th-27th Gibraltar Point, Sep 27th, assumed same as Tetney 2014 Susworth, Aug 3rd-11th Willow Tree Fen, Nov 28th-29th 2016 Deeping Lakes, Jan 12th-14th Crook Bank, Theddlethorpe, Apr 17th Stallingborough, Nov 4th Covenham Res, Nov 8th Skidbrooke, Nov 13th-Dec 21st 2017 Deeping Lakes, Feb 18th-May 16th Saltfleetby-Theddlethorpe, Mar 1st-10th Gibraltar Point, Mar 19th-20th Alkborough Flats, Mar 21st-24th Anderby Creek, Apr 16th Frampton Marsh, two, May 30th-Jun 3rd, then one intermittently (?) to Jul 10th Baston Fen, three, Aug 24th Saltfleetby, Sep 9th-13th, then two, Sep 14th-18th, then three, Sep 23rd
All were single birds unless stated. Note that 2016 and 2017 records are preliminary and unverified.
However, there have been three together before, at Baston Fen a month ago (per BirdGuides - I know no more about that) - and also four together near Mablethorpe on 7th May 1992. Those birds were believed to be part of a group of five that had been in Yorkshire the previous day. I am too young to remember that event but have no reason to doubt it being a good record: it was accepted by BBRC (as Cattle Egret was then considered by them).
E&OE
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