I believe the 200 beta is a 250 sleeved down if it is possible to remove the sleeve you would probably have to have the barrel chromed easier to buy 250 (or 270) top end though not cheap!
I have been to stay with steve bamford in spain (casa montes trials holidays)he has 100's of acres available on his doorstep contact him through his website or facebook page. I guarantee a warm welcome! also i know of this place in wales, though no personal experience http://www.cambrianway.com/index.cfm?id=106
always relyed on gravity- unbolt caliper & leave to dangle- top up reservoir, open bleed nipple , make cup of tea top up res. now and then. always worked for me!
