I was also goin to suggest getting a share in an a/c, but you might find there are some who might not want to commit to letting you do 150 hours or so in a short time as they may feel it will limit their own access to the aircraft. Then again there my be some who would welcome a few hours outting on the airframe to reduce the impact of their fixed costs. Just something to bear in mind.
Would also endorse what was said earlier about making the most use of the time. Go on a round-Britain trip or something. Nothing worse than 100 x 1-2 hour local flights in the log book. I'm not a professional logbook reader but if I came across 150 hours of local flying I wouldn't think you had much get up and go.
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"Take-off is optional, Landing is mandatory"