As Dukey says, the length of the marraige is relevent (it feeds back to the isseue of what is fair to both parties)
However, nothing is 'ring-fenced', so a court has the discretion to take into account a greater proportion of the pension if it believes it is fair to do so.
The split may be on a straight % of the CETV but in some cases (Police pensions, for example) CETV values often don't give an accurate picture of the true value of the pension and in order to acheive equality in terms of value, a proper report from a pensions actuary may be needed to work out the appropriate split.
If the receipient wants cash in lieu of pension then normally the starting point would be 25% - i.e. if they would be entitled to £20,000 in
pension share, they would get £5,000 in cash. However, if close to retuirement, a higher lump sum may be fair. Equally, where the
offsetting is becasue the person with the pensioon wants to retian it, and the other party would prefer a pension share to cash, they may negoitiate fora higher lump sum (esp. if they are planning to use it to fund a pension!)
Future earning capacity is relevent - it would depend why the person is not currently working in their profession and how easy, realistically, it would be for them to return to it. (beraring in mind that if they have not been working for a while, they are likelyto find it harder to get back into work, even if they have appropriate qualifications)