Thanks for the replies above and private messages. It was great flying and here are a few heli-friendly places, should others be interested:
Armathwaite Hall
www.armathwaite-hall.com
Low Wood Bay
https://englishlakes.co.uk/low-wood-bay/
Storrs Hall
www.storrshall.com
The Swan Hotel
www.swanhotel.com
Leeming House
www.macdonaldhotels.co.uk