Once you have arrived in London, there are assorted places that you should, you really should, go and see.
A good starting place is Trafalgar Square with Nelson’s Column right in the centre. It is a 51m column, poised on top of which is the hero of the Battle of Trafalgar, who was killed while winning in 1805. The four lions which surround the column are of more recent date, having been sculpted by Sir William Landseer in 1868. There are many claimants to being the heart of London, but Trafalgar Square has the best right, because it is the hub of so much that is wonderful.
Just alongside is the church of St Martins in the Fields, which is open throughout the day and has been around for a long time. The current church dates from 1726, but there has been a church on that site since the thirteenth century. This is the parish church for Buckingham Palace and, yes, there is a royal pew. The church has some wonderful lunch time concerts, which are normally free.