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from xscope contains these words:

Just placed an order with screwfix, which came to £45, and a few
pence.

Realising that free delivery is for orders over £50, I was looking
around the for something about £5, which would essentially be free
(given the otherwise £5 delivery charge).

Then I spotted - vouchers, so I added a £5 voucher, which hey presto
takes me above the free delivery threshold, so I get the £5 to spend
next time.


Sadly it doesn't answer the problem of those in the Northern half of the
UK where, even on the mainland, there is NO free delivery from
Screwfix, no matter what the order. Hence Screwfix is on a list of
non-preferred suppliers.