If flying nr. Horsham you'll undoubtedly be on the south or western side.
I strongly recommend you make yourself aware of the at least 1/2 dozen strips/airfields crowded in there, all of which are by Air Law entitled to folk flying nearby to mind their pattern.
Some routinely use safetyCom, but not all.
Some are well known, but not on the Charts, others less so; their ground level is up to 300 ft. -so giving them 1000 ft crams you into ~200 ft slice.
Info's from Lockyears or AFE or Pooleys or BMAA & several web pages [or PM me, mikehallam at btinternet.com ]