EEGW inspector stamp

Several years ago I acquired a large aluminium fin that was part way though milling and still had its holding posts attached.

It was unidentified and posted on the “old” here without further ident.

I was cleaning it up this morning and found numbers and stamps.

The fin is made in two parts – both with an EEGW stamp.

The part numbers are :

H185367  MR467847/21 and HI863I0 ISS1 RN438340 DP

MR479353/34 and H186309 ISS1 RN438336 D

So I am guessing from an English Electric site ? I know that they made missiles too but it does not look like a thunderbird part.