Yep it can flood - 11 weeks in the last decade. Long mountain is actually only 832ft high aqnd the circuit height is 1500' although there is a poor weather one at 800'... The average experience of the current instuctor team is just under 1000 hrs which isn't bad and the CFI has 3000+hrs instructional and has been there for many years.
When I worked there as an instructot it was £10 a day retainer plus £10 an hour airborne. Wages have since gone up. Given that the school is busy you make more at Welshpool than at most PPL flying schools. Easily.
But Whirly is right - you don't get ought for nought.
Cheers,
WWW