LHR Easterly Operations question
When Easterly Operations are in effect at LHR, I'd be interested to know how aircraft routing onto the final ILS approach is determined.
I live in Twyford in Berkshire, which is approximately under the extended centre line of 09L. Some days during Easterly Ops, we get a lot of aircraft turning left over the town and then coming overhead as they line up on the ILS. Other days, it seems as if most aircraft turn nearer the airport. For example, I was coming back from Edinburgh the other day, and the left turn was made just west of Maidenhead (the plane was coming from one of the northern holding points).
I was just curious as to whether there are procedures to avoid overflying certain areas continually, or whether the routing is mainly determined by traffic load, and achieving the required separations.
Sorry if this is a naive question, and I hope someone's willing to answer.