Deer & rabbit deterrants!! Any ideas?

I have a friend who’s got awful problems with deer and rabbits eating just about everything! It started Last summer during the heatwave has eased off during the winter and as there’s less to eat but now things are starting to grow they’re back!
its a big garden so putting fencing all around would be so expensive it’s not an option.
Im just wondering if anyone has used anything to deter them? I have read one post on here about putting human hair around the plants and stringing up old cds. But any other advice would be welcome! Individual plants could have wire netting or chicken wire put on them but it will end up as a garden full of chicken wire as they seem to be eating just about everything! Including spurge!!
its a big garden so putting fencing all around would be so expensive it’s not an option.
Im just wondering if anyone has used anything to deter them? I have read one post on here about putting human hair around the plants and stringing up old cds. But any other advice would be welcome! Individual plants could have wire netting or chicken wire put on them but it will end up as a garden full of chicken wire as they seem to be eating just about everything! Including spurge!!
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By now, both deer and rabbits have got used to the local restaurant so the only sure thing to do is keep them out and block any existing burrows or they will come back and nibble all the juicy goodies. The RHS website has lists of plants supposed to be less or unattractive to deer and rabbits but the is probably quite restrictive.
https://www.rhs.org.uk/advice/profile?pid=185 and offers this info on rabbits - https://www.rhs.org.uk/advice/profile?pid=219
Outside the cage there are quite a few things they don’t eat here .....
Plants our deer don't eat:
Spring bulbs
Snowdrops
Daffodils
Hellebores
Primroses
Scilla
Chinodoxa
Alliums
Summer Annuals
Petunias
Isotoma
Salvia
Diascia
Lobelia (they sometimes have a nibble, but don't come back for more)
Rudbeckias (the half hardy ones with fuzzy leaves ...they do eat the perennials like Goldstrum)
Zinnias
Perennials
Peonies
Oriental poppies
Lavender
Aquilegias
Echinops
Euphorbia
Lupins
Centaurea montana
Agapanthus
Nerines
Lithodora
Aubretia
Sempervirums
Sage
Oregano
Rosemary
Cyclamen (the hardy ones, not the fancy ones sold as winter bedding)
Ferns
Heathers
Grasses
Shrubs
Daphne
Most viburnums
Hydrangea macrophyllia ( not the paniculata ones)
Box
Pieris
Buddleja
Rhodedendrons and deciduous azaleas (not evergreen azaleas)
Magnolia stellata
Wisteria
Cotoneaster
Pyracantha
I too heard about the human hair thing - you could always beg a bagful from your hairdressers and try it first - much cheaper.