cardiff ajax average speed on 50 miles at what speed?

I am new to cycling had my bike for just over a month. I would like to join the Cardiff Ajax to make some cycling friends and go on the Sunday rides. The slow passed ride is 50 miles which i'm currently working up to. What what is a slow pace. my average speed is 12-13 mph. Should I try and get thid up to 17mph before considering riding with the club?
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http://www.cardiffajaxcycling.co.uk/
A lot of clubs vary in their interests with some focusing on racing, others on more sedate touring and some with a blend appealing to one and all. 12-13 mph does sound a little slow but they may well have one group doing the rides at that kind of pace.
However, whilst you look around for a club that you like/suits you then you might want to work on that speed. I suggest that you keep your mileage to a max of 30M but aim to up your average speed by working harder each w/e ride. When you can do 30M @ 15-17mph, increase the distance to 35 but try and maintain the speed, etc. If you are finding it a bit easy, throw in a hill or two.
i rekon 50 miles with 15mph average would be a nice target.