No. You may mean "aliens? what a load of bollocks!". And that may be right. But UFO's are, by definition, Unidentified Flying Objects and so, by definition, do exist.
Seen two, both in Essex. Once at Clacton, above the beach. And once when tripping at university (Colchester). Haha, tripping I hear you say. Tripping was incidental. Several non-tripping people saw the same thing.
Could have been anything. Most of these things are usually attributable to the military fucking about and I could easily believe that in both these cases. But, as they stand, they were unidentified. Q.E.D. UFO's.