Depends on how much money you've got to spend and over how much time frame.
My hours building was done over 2 years, so unfortunately I spend most of the time doing 1 flight a week when I got paid. Weather permitting, I just hopped around to different airfields for a coffee, I would have liked to have done more with the opportunity.
I (personally) wouldn't recommend using GPS or sky demon, although I'm sure most people do. I only say that because it'll enhance your map skills, your scan and your ability to use navaids for navigation which you'll need in your CPL. Although depending on what aircraft you do your CPL in you may have GPS anyway, but you probably won't be allowed to use it, so don't rely on it. You say you're based at Blackbushe, so if it keeps you out of Class D airspace, it may help. That magenta line can be addictive.
Recording your flights is a good idea for your own learning, and also to possibly record any incidents that may happen which you can use as evidence. I may sound a bit paranoid, but I caught some shocking things on my GoPro.
Should you go to le touquet? Why not? The more experience the better. I'd also recommend the Isle of White, and The Isles of Scilly.
Last bit of advice. Although you should use your time to fly to different airfields (grass, asphalt, small local clubs and also larger intl airports if you're willing to pay the landing and handling fees), save a few hours for your own training brush ups, PFLs, stalls, VOR tracking, circuits etc, just to make sure you don't forget how to do them.
You only get to do your hours building once, most people who end up in the RHS of a jet let their SEP expire and never fly GA again, enjoy it.