Ah! this is not good. Deer eat fast and are so agile, a six foot fence is usually needed… maybe your gamekeeper friend can help? Shooting deer is not allowed, I think that limited culling is permitted.
The cold weather is causing more wild animals to come searching for food and I have a rabbit (or two!) and hare eating my chervil and rocket at the moment, also some endives and spring cabbage. Fleece is one way of keeping them off, or netting held up by cloche hoops.
Use fencing in your garden. The fence should be 11 inches taller. Be assured that invisible deer fencing really is-you can’t see it from most angles, so you get the protection without feeling like you’re living inside a cage. Don’t forget to deer-proof the driveway with its own fence or cattle guards.
Fencing and proper deer fencing comes to mind first.Has to be very high and costs of course.
When we were in Sweden noticed lots of unwashed fleeces around garden veg. plots. Were told the strong smell of lanolin kept the deer away. If they are hungry can’t imagine it would work. Same sort of principle I suppose as Badger muck to keep away Moles.