My home town - alas moved away many moons ago but there's two jumbles - one in Longridge which isn't actually in Preston, just the postcode and dialling code makes it Preston. I've heard a few snippets about this one and it's supposed to be decent, all indoors, decent size but I've never attended. There was another one at Preston College (may be called something else these days) and that one is a little more generic. Sorry I can't advise any further.
However if you do go, take a bike and get accommodation north of the city and you can ride upto Beacon Fell http://en.wikipedia.org/wiki/Beacon_Fell,_Lancashire
, post ride refreshment in The Green Man in Inglewhite http://www.qype.co.uk/place/2156317-THE ... NN-Preston
or head over for flatter rides around St.Michaels - it's all good riding round these areas.
Rick Powell 753 Track / Ribble Gran Fondo / Colnago Asso / 1975 Harry Quinn TT / 1990 Concorde Prelude / Vitus 992 / Keith Coppell Lo-Pro / 1986 KAS Vitus 979 / 1995 Mercian Strada Speciale / 2011 Raleigh GAC Militis 3 ex Graham Briggs / 1995 Ribble 7005 / 1986 Alan Super Record / 1985 MK1 Vitus 979 /
On the bench: Sirius 853 TT / Sun Solo Chrome / Ciocc Designer 84 / Giant TCR0 Pro Compact / Ribble 653 Tourer / Daccordi Lo-Pro / Look KG96 / Bottecchia Equipe / Look KG231 Credit Agricole / Contini Grand Prix / Aende Lo-Pro / TVT / Langdale 653 Pursuit /