Friday Night Skate - or FNS as it is known to regulars - is an informal skate meeting and takes a different route each week accompanied by a sound system pumping out dance music and old-school classics. Costing only calories, it starts at and (usually) finishes at the Duke of Wellington Arch, Hyde Park Corner. The two-hour (with 15-minute half time), 10-mile route sets off along Constitution Hill, Piccadilly or Park Lane before meandering in all number of directions, taking in the sights and sounds of anything from Big Ben and Buckingham Palace to St Paul's Cathedral and London Bridge.