I just got this email:
Hi
Thank you for saving the configuration
Good news order TODAY and put the code cpuk999
in the promotion box and ALAN in the sales box.
And receive a further 3% off the price.
This offer can not be used in conjunction with any other.
And codes must be entered at time of purchase.
Please call 01914978341 option 1
So it looks like if you build a config and save it, and email it to yourself using their site's form, you get a coupon in a few days. So, something to know if you go with them.