If he was originally happy with £69K, then (finger in the air here) I assume he paid about £50-55K? That's enough if it's his own money, but if it's borrowed money like a lot of small dealers use, he'll have to service that debt. Multiply that by however many cars he's got in stock and it soon adds up!
Might also be a case of bad timing. If, as someone said in another thread, EU countries are now adding VAT at 20% plus import duties, it could be killing any cars coming from Britain (for now, anyway). That money on top of purchase price, plus shipping, plus LHD conversion, plus registration....bloody L, buy a local 911 GT3 or a Yaris GR instead!