Ok, home now and sitting outside a half bottle of Italian red, so a few more thoughts...
Hummm, I started my 'proper' pension in 2010 when I joined Sky full time, looking online my fund is around 20% higher than what's paid in.
So ~5% growth year, which looks average?
No. More like 9% growth per year.
You see, not all the money has been in there for the full 4 years. If you're putting in £100 per month, then over 4 years only £100 has been in there for the full 48 months, £200 for 47 months, £300 for 46 months....£4700 for 1 month and £4800 total now. But your actual fund is npw worth 20% more than than the total you've payed in - £5760. The effect of this drip feeding is that your actual return is double the apparant yearly return. To get the same return from a bank account you'd have to get an interest rate of 10%.
And then there is compounding. In order to get an effective APR equivalent, you have to compound, meaning that you get interest on the interest. This results in a slightly lower effective interest rate. My Excell spreadsheet reckons that to get a 20% increase in value over 48 equal monthly payments, you need a 9.04% growth rate. Inflation is currently 2.5% ish, so you're currently well ahead of the nominal 5% growth rate (after inflation) I suggested you plan for.
Next up, your sharesave scheme. Keep buying any discounted shares that are available, but make sure you sell (most of) them once they are available for you to do so - which is usually after either 3 or 5 years. Few experianced investors would ever invest in only one share - it's far far too risky. To spread the risk you need at least 7-10 shares spread over a diverse range of companies. If you keep piling money into only Sky shares, and never sell any, you become horribly exposed should the Evil Murdock empire ever fall apart. Lots of former employees of big companies (like LLoyds bank, and Northern Rock) diligently saved into the companies share scheemes all their working lives. Then when the banks went belly up in 2007, they lost the lot, because the shares became (almost) worthless. Don't fall into that trap.
Finally, I'm not an IFA, or a FA, or anything else. These are my oppinions, not professional advice. And oppinions are like ar5eholes - everyone has one.