I popped over to Cosford late this afternoon after fradu mentioned the fencing. Alas, he was right. Very sad. I was there only last weekend and there was no hint of the relocation at the museum.
A sign on the 707 fence says that the removal order is:
B707-436 (G-APFJ)
BAC 1-11-510 (G-AVMO)
Vickers Viscount 701 (G-AMOG)
HS Trident 1-C (G-ARPH)
Vickers VC10 (G-ARVM) to Brooklands.