In reply to ar2000d:
There are various providers that offer the training over 2 or 3 weekends. Just google for "split weekend summer mountain leader training" and you should get a bunch of hits.
The find a course search on the Mountain Training website can help too. Just stick in some dates and then click on the info section which gives the dates + details of whether it's over split weekends or not.
E.g. for April the following providers (giving their name under the Mountain Training listings) do split weekend courses:
Yr Hafod Scout Activity Centre - over 3 weekends
Steve Spalding - over 2 weekends
Pescod - also does split date courses but the April dates don't span weekends
Pete Goldsmith - 3 weekends, one in April, May and June
Post edited at 19:08