Urgent! F1 exhibition Wednesday 20th February

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My son has a voucher for a single slot at 5.30pm tomorrow (Wednesday 20th February) for the F1 exhibition at the Excel centre. I understand that he topped it up and his booking includes a ride on a simulator. 
He’s now ill and the voucher is non refundable although they’ve told him it’s transferable. Selling for voucher face value of £30. Please contact with phone number via PM please. 

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Any reasonable offers considered!