Hi Homegirl,
If you have a unit linked plan it can be quite easy to work out what the plan is worth.
Your statement should give you the number of units that the plan has, and then if you can find the fund that plan is invested in, on the providers website for example this will give you a unit price. You then multiply the two together and that should give you a current fund value.
Example: Plan has 250 units, and you are invested in ABC Investments Managed Fund and the unit price in the fund is £10 - you multiply the 250 x 10 and this gives you a value of £2500.
If when you do locate the fund values you are given two values - a bid price and an offer price then you use the bid price as this is the price that they sell at.
Hope this helps!
Matt