Slight concern about Neighbours garden, trees etc.?

not much you can do. with the guinea piggies ask if they could move them as your husband has this allergy either to the animals or the bedding etc they're on. as for the washing nothing you can do. perhaps one day you could jokingly say to them you had guests round and we were having a laugh at your undies or whatever. that may embarrassed them perhaps. really they do have every right to hang out their washing. the cherry, cut it back if its on your side. maybe you could ask them in time if you could renew the trellis for them as it looks very old and rotten. good luck.