It's probably worth £800ish. I've spoken to the seller - seems a tidy chap.
If you're tempted to buy this instead:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT
pm me before you bid on it.
I've got a spare console from an SR4.7, which may be of interest to you? It could work well in an SR4.