SL postcode area
These cover east Berkshire ( including Slough , Maidenhead , Windsor and Ascot ) and south Buckinghamshire ( including Iver , Gerrards Cross , Marlow and Bourne End ) , plus a very small part of south-west Hertfordshire . 
<triplet> Berkshire <subj> Buckinghamshire <obj> shares border with <triplet> Buckinghamshire <subj> Berkshire <obj> shares border with <subj> Hertfordshire <obj> shares border with <triplet> Hertfordshire <subj> Buckinghamshire <obj> shares border with