If You Protest You Must Be Mentally Ill.
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For more on marking an answer as the "Best Answer", please visit our FAQ.Here is whats available at Halfords, though I'm sure there are other makes. No idea how good they are. http://www.halfords.com/webapp/wcs/stores/servlet/CatalogSearchResultView?searchTerm=parking+sensor&storeId=10001&catalogId=10151&langId=-1&pageSize=10000&beginIndex=0&beginIndexForPagination=0&sType=SimpleSearch&searchType=EXACT&searchTermCaseSensitive=no&searchTermOperator=LIKE&searchTermScope=3&coSearchSkuEnabled=true&resultCatEntryType=2&sortOrder=ascending&resultType=2&topCategoryId=ALL&x=16&y=8