Try Locky's Bar in Wombwell The landlord is a former kickboxing champion but has lots of contacts in local amateur boxing. I'm sure he'd be able to put you in touch with the right people.
Yoiu could do a lot worse than Fred Gummerson mate. <div><font face="Tahoma" color="#808080" size="2">HARD & FAST AMATEUR BOXING CLUB</font></div><div><font face="Tahoma" color="#808080" size="2"></font></div><div><font face="Tahoma" color="#808080" size="2">F [Fred] Gummerson</font></div><div><font face="Tahoma" color="#808080" size="2">166 Brierley Road</font></div><div><font face="Tahoma" color="#808080" size="2">Grimethorpe</font></div><div><font face="Tahoma" color="#808080" size="2">Barnsley</font></div><div><font size="2"><font face="Tahoma" color="#808080">South Yorkshire </font><font face="Tahoma" color="#808080"> </font></font></div><div><font face="Tahoma" color="#808080" size="2">Telephone: 01266 711909</font></div><div><font face="Tahoma" color="#808080" size="2">Fax: 01226 780075</font></div><div><font face="Tahoma" color="#808080" size="2" /></div><div>http://www.abforum.co.uk/clubs/hard-and-fast-abc.aspx</div><div><font size="2"><font color="#808080"><font face="Tahoma">martinutley@hotmail.co.uk</font></font></font></div>
www.thingstodoin.org.uk Take a look on here, its a website that shows activities in and around Barnsley gives contact numbers and addresses for all sort of activities.
try this mate. best Gym in Britain. St Thomas Boys and Girls Club, Newman Road, Wincobank, Sheffield. 2 mins from Meadowhall.