Many parishes in the UK ether share a church building with Anglicans or Catholics, and ether there alter table is used or a mobile Alter is used (normally to move the Alter closer to the people if there are a large number of steps involved or a long distance from the Alter to the nave).
One Parish I attended where we have use of a Catholic Church which is more recent in construction so the Alter table is in the middle of space so the rubrics are followed as written. I have also been to two Churches which are ether owned by or the Orthodox have sole use of where for practical reasons a Alter Table is placed closer to the people than the east end as it is more practical for the clergy as the fixed alter is ether a long distance from the nave or the steps would make it difficult for the clergy. Another Parish I attended for a while used an early medieval Church which had a fixed Alter and our priest adapted to the lack of space by using the rubrics which worked in the limited space as it was a very small building. I have found that in my experience it depends on what is more practical for the clergy as to if the alter present in the church is used or a table closer to the people.
I would note that few Churches in the UK have fixed Alters now and if they are they tend to be away form the east wall as the common practice for most non-Orthodox is to celibate facing the people. The churches which have a fixed alter at the east wall were mostly built by the Oxford Movement or are lager churches or cathedrals which often have a parish alter which is a movable table (although the table is normally covered so unless you know it can look like a fixed altar). Most of the fixed Alters were destroyed during the reformation and replaced by tables due to the theology of the reformers, although some churches retained their stone alters (these mostly being the cathedrals and some of the large churches often ones in privet hands not the state church, or small remote chapels which were forgotten).