Ams/lcy
On BA website it shows they have only withdrawn the BA8452/3 on the 5th, 6th, 12th, 13th, 19th, 20th, 25th (Bank Holiday), 26th and 27th May and back to normal in June
Basically BA8452/3 operates days 1,4 and 5 with the exception of the bank holiday on the 25th.