Parking Space for Excavator Wanted. High Visibility/Traffic

I’m looking for long or short term parking place(s) for my excavator(s) in a high visibility, high traffic area within 30 miles around Luton, Bedfordshire, which includes Northern part of London up to Milton Keynes along the M1. There will be a sign on the excavator “for hire” with my contact details - that’s the reason for high traffic.

What about that half finished hotel site before Letchworth/Welwyn junction? I haven’t been that way for over a year but there used to be adverts on trailers in nearby fields.