Must... Resist... Evil... Plans...

Yes, especially if you plan to sell your house any time in the future. Don't forget that under UK (or is it just English/Welsh) law nowadays you have to tell potential purchasers of any neighbour disputes, if you don't tell them and they get caught up in them after you sell they can sue you...

Fun eh ?

Oh, for the second time this evening, IANAL (thankfully).