My fastest parkrun actually occurred when i found myself a little hemmed in for the first couple of minutes and therefore ran more evenly, not flying out of the blocks for the first km.

Although my fastest actual 5km time was my usual tactic of pushing hard from the off, although i somewhat fell off in the final km.... i just happened to be very quick over the first four... i'm hoping towards the end of this build up to Brampton-Carlisle i might be somewhere near pb pace by running evenly.