Hi John,  
 
Thank you for your question. We can make both the Artisan sprung base and the Contemporary Platform base with a quarter split.  There is an additional cost of £100 and as it is a bespoke item it would not be covered under the 60 day love it or return it guarantee.   
 
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I hope this is helpful and if you would like to purchase this option please contact the office on 0161 437 4419 to arrange a payment link as this option is not available via the website.  
 
Kind Regards
Michaela