At the risk of being bombarded with suggestions....

Poor you :( that's a great loss. So much has been hit by the prolonged frosts. It's been the coldest, wettest winter for several years. Even here in the soft south:hehe: I've been surprised by the damage it's caused.
I persuaded a client to put 10 lemon trees in a greenhouse instead of leaving them in tubs round his outdoor pool, as he wanted to, but they're looking very sorry for themselves. I haven't lost hope though, as a friend, who imports plants form Southern Spain and Italy, reckons there's a chance that new buds might show - if we get a bit more winter sunshine.