let's have a look at UPPER CALDECOTE then...

52.0970545,-0.3012949https://www.google.co.uk/maps/place/Upper+Caldecote,+Biggleswade/@52.0970545,-0.3012949,15z/data=!3m1!4b1!4m5!3m4!1s0x4877cbf8475dc6e7:0x51122673ca7bf8c2!8m2!3d52.099296!4d-0.296846?hl=en

oh I know what this is all about...whilst drawing those hearts upon the beach...the man was to talk about something 'LO'...talking to himself, of course....I was quite a distance away, at the time...and I didn't get any nearer...see previous notes....

a certain 'lo' frequency and a coded ad...go figure...

oh and northill....is this a 'joke' around nort-hill...the noughts...and 'mr zero'?

"parrot hill" replies MI5 ONLINE...