When I passed Northolt at 0645 on Fri 8th June'84 there were 5 CH-53C's present in support of President Reagan's visit but no VH-3D's were seen.
10924, 10928, 10930, 10932 and 01630
The Northolt section of `BAR` gives a good explanation of what happened although serial tie-ups couldn't be confirmed in relation to Lakenheath.
29 May - 10930 and 10932 arrived as did VH-3D's 159358 and 159360.
30 May - 01630 arrived
4 June - VH-3D's 159357 and 159359 arrived
5 June - 10924 and 10928 arrived
By 1300L Sun 10 June only 3 CH-53C's remained.
On 6 June at 2030L 2 VH-3D's flew Northolt - Lakenheath as "Nighthawk 05/12" but didn't return.
On Sun 10 June, following President Reagan's departure from Heathrow, the remaining 2 VH-3D's departed Northolt at 1300L for Lakenheath together with 2, of the remaining 3 CH-53C's.
Later on the Sunday the 2 CH-53's returned from Lakenheath to join the 3d and all 3 of them then departed Northolt for Sembach.