Since I was in Westminster Cathedral on Saturday afternoon (venerating the Relic Image of Our Lady of Guadalupe) I was able to see the beginning of the regular Low Mass organised by the Latin Mass Society in a side chapel. This takes place on the 2nd Saturday of each month.
Not being a Londoner I've not seen this before. It is good to see the side chapels being used for Mass, although the faithful were spilling out into the nave.
Something else I've not seen before was the Tabernacle in the Blessed Sacrament Chapel dressed in Rose (for Gaudete Sunday).
There are a few more photos here.