PG - if you haven't already done so, go fly the cheapest piper Arrow you can find so that when you start to fly EFT's more expensive one, you wont waste time learning how to fly one.
Learn how to do steep turns with all the instrument panel covered up - and look at the downgoing wing as you roll out (ask your instructor).
Do some gliding turns - starting with a straight glide, then turning at 30° and then 45° angle of bank. (Ask your instructor)
Do lots of PFL's - always landing into wind.
Do millions of circuits - always landing in a sensible touch down area for that length of runway - always with the nose wheel on the centerline.
Ask some friends of yours to write down the name of a feature (town, lake, crossroads, railway bridge, airfield - anything) that is 50 miles away from your departure point. Get them to seal it in an envelope. Go to your base airfield - open the envelope and then give yourself 30 minutes to plan the route, get the w/x, get the notams - everything - then go fly the route staying within the 50' already mentioned - but within 5° of your nominated heading - and within 5 knots of your nominated indicated airspeed.
If you drift off track - forget about it - figure out the quickest way from where you are now to your nominated destination.
Have the same friend write down a diversion and seal it in another envelope - which you can open in flight at a predetermined point. It will either say "Divert when ready to XXX" or "Continue to destination and then divert, from overhead, to XXX"
Take another pilot with you - ask them to nag you if you go 20' off your altitude, 2° of your heading, 2kts off your airspeed, make a crappy radio call not in accordance with CAP413, close the throttle at any time they wish, fail radio nav aids or aircraft systems at random. Ask them to be as hard with you as they possibly can be.
Read CAA Standards Document 3 - it has all the answers.
Re-read your air law, remember the factorisation for runway lengths, remember your UK airspace classifications, remember that you cannot actually DO a 50 mile cross country on a simulated public transport flight. Keep asking questions on here.
When do you start the actual training?