The authorities have set weather minima for Fixed Wing VFR flight below 3000ft, and the R44 carries certain restrictions (around wind and gusting).
Why not use these?
However you need to focus more on flight planning and on having suitable alternatives to divert to if weather minima are below an acceptable standard on the hour.
You can be fairly certain about UK weather at +3 days and pretty much accurate the day before. If it looks like its going to look marginal the next day, take the train.
Over the past five years ("since records began", well mine anyway) we have on average 120 unflyable days a year in the UK for the type of VFR flying you are likely to do, so this leaves a lot of potential days when it is above the VFR minima for low hour fixed wing pilots and within R44 wind ranges.
Take a look also at the R44 crashes (and other rotary) in the UK. Mostly poor weather, at night and VERY marginal conditions.
Safe flying is about planning (routes, weather, diversions, conditions en route); effective supervision (somebody with grey hair who watches over thee; and confidence in what you are doing or about to do.