@IoanSaid I guess it depends on your budget and level. The Velodrome had a load of Dolan metal bikes we hired with "aero" tubing so I guess that's not a bad place to start.
However if I was racing, being the vintage Raleigh addict (and cheapskate) I am, I'd go on ebay and grab a cheap Raleigh track frame.
Tbh at no point on track did I think the bike was the limiting factor...