Originally Posted by
dc2447
I don;t undertand the significance of Waitrose unless we are talking about the vouchers thing

I assume the trick works like so:
1. buy £20 in JLP vouchers with your Avios Amex (and earn 250 Avios in the process)
2. spend your £20 voucher in Waitrose on something low-cost. (A copy of the
i for 20p?)
3. Get the change in cash. Put it straight into the bank, perhaps.
4. ...
5. Profit!