pulling hp5 to iso 250

Yesterday I managed to take a couple of rolls of Hp5, pulling it to 250, at a fashion show held on Buchanan St in Glasgow. What is the best way to develop these to get a good neg (i.e. hopefully little grain at a 10x8 print using all of the neg that will fit on the paper). Incidentally the lighting was flat. Will ID11 diluted to th 1:3 concentration, but developed for the 1:1 time produce suitable negs? or do I resort to Perceptol using ilfords times?

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