myminingpool.uk is a pplns pool, what does this mean?...
Pay Per Last N Shares (PPLNS) - Block rewards are distributed among the last shares, disregarding round boundaries.
In the accurate implementation, the number of shares is determined so that their total will be a specified quantity of score (where the score of a share is the inverse of the difficulty).
Most pools use a naive implementation based on a fixed number of shares or a fixed multiple of the difficulty.
The share-variance can be reduced at the cost of increased maturity time, but there is no way to decrease the long-term pool-variance.
PPLNS is used to stop pool hoppers, the more you put in the more you get out.