Halfords 14% off Boardman CX Bank Holiday

I was just on point of investing and this deal has come up. I've been told I can also use the British Cycling 10% off voucher so all in all looking at £728 for a brand new bike against the £950 list price. Might be worth a punt.
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However, you can get an extra good deal with a bit of effort. Many discount card schemes, eg countdown, NHS deals, the MoD card all allow you to buy Halfords give vouchers with an approximate 7% discount. Therefore you work out what you want, order the relevant amount of gift vouchers, they normally come quickly, order online with whatever discounts are going, go to the store with the BC voucher. So in this case you get 14% off the bike, then 10% off that, then a further 7% off, which is around another £50 in the case of the bike being discussed. I have done this in the past and had no trouble.
Am pretty sure they told me to order/pay online (full price) for store pick up, then the store would refund the original sale and re-sell it minus the BC voucher.
I imagine the cash back would be cancelled when the original sale is refunded