and i cannot find anymore up to date information.
Air Navigation Order 2009 No. 3015 Schedule 7, Part B, Section 1, Sub-Section 2 (5): "Cross-country flight means any flight during the course of which the aircraft is more than three nautical miles from the aerodrome of departure." Google and the UK Regs are your friend. It's the last bit of text in that section, so scroll all the way down to the bottom.
But, I'd have you take a moment and consider what the purpose of cross-country training is and what you're meant to get from it. If you're headed down the road of multi-engine flying in an instrument environment (as you state) or you ever want to pursue flying beyond a hobby, you have to be comfortable with going a lot further afield than 3 miles. Consider this definition from another regulator as it applies to what a sector is defined as for airline pilot training "a take-off, departure, arrival, and landing including at least a 50 nm enroute segment." Getting out of your local area and having to actually navigate is why regulators require 200 nm and 300 nm cross-country flights for license validation.
Don't make the mistakes I've seen other students make - they go out building hours for the sake of the logbook, but they're not putting into practice the principles and lessons they have already learned. As a result, when it comes time for the next course, their knowledge and skills have dropped well below that required for the license held in the first place, and they end up spending way more money than they otherwise would have because they're too rusty to start the course. So get out there, plan a lot of cross-countries, fly a few of them, and safely push your comfort zone.