If you are going to the lake district, you're more likely to find tourists than wildlife at this time of the year. Remember on a crop body thats a 480mm field of view on a full frame. Hence without IS, your min shutter speed for handholding is 1/500 sec which means high ISO and on some occasions insufficient light if you get a deluge. The 55-250 IS has had reasonable reviews and would fall within your budget. The only possibly downside is the slightly shorter focal length and the f5.6 aperture at the long end but the beauty is the lower handholding speeds and the flexibility that a zoom offers. Disclaimer any advice is my own opinion and ultimately the buying decision must be yours.