Ooo Ek Tim, you're just gonna hate me. We bought our cast iron griddle pan from Netto for £4.99. It looks a bit smaller that yours, but it does the business, in fact I would list it as one of our "all time best buys"!!
No offence intended, but I think you should probably take your own advice and shop around a bit.
Netto, Home Bargains, Poundland, Poundstretcher et al do have some wonderful bargains, but you've got to be in the right place at the right time, and it's no good saying 'I'll get that next time I'm here', because it won't be there (if you know what I mean?). I just love looking round these 'junk shops'.
valmarg