I think Glenn, advertising in Club magazines assumes that the average member has sufficient funds, desire and space for yet another vehicle of the same marque. I imagine this is not very Iikely to be the case.
I think anybody who buys an Aceca, will know quite a lot about the model and therefore will probably be happy to do their own checks and buy it off your doorstep. In this case you don't necessarily need a dealer, who's services are primarily used by people who are not happy to trust their own judgement. However, some dealers, Rod Leach, Justin Banks can add value as they are well known dealers. The issue with these is that your car will be more expensive and therefore have a smaller audience. Also it can be awkward if they have the car all the time.
I think auctions a waste if time as again the cost to the buyer is high and the seller often receives a low price. Their commission spread can approach 20% in some cases. Also don't think you will get your money immediately after the auction. It's weeks later and that's if they don't go bust in the interim.
Some years ago I was selling a well known, but well used Austin Healey 3000 works type rally car. I tried an well known auction where it got lots of enquiries but no bids. I tried the free online auction sites and also the expensive ones like Classic Driver.com. I made scores of friends but didn't see a single buyer. So I asked dealers for their advice,. The only offered one certainty, namely Classic and Sportscar Magazine. All the others are nowhere near its circulation. So I advertised, it in there and sold almost at the asking price. with the first ad. One other tip. Don't put an email address in the ad, only a phone number. That ensures that any contact you might get, will have more chance of being an actual buyer. Good luck.