I have already found the on demand route but asking for purchase of the programme/series "The Good Wife"
Can you explain what you mean here? Because if you've found the OnDemand programme, then you've found the answer and that's what a 360 user is going to show you. I can see all the past series of "The Good Wife" on my V6 and so the availability is not the issue here.
I suspect you have another problem, and it's nothing to do with your 360 box but everything to do with your package.
OnDemand content comes in 2 main types..
"CatchUp" shows programmes recently broadcast and generally in the past 30days. Inclusive on all TV bundles.
"Boxsets" are complete and/or past series, these are inclusive on Maxit/XL/Full-House bundles, but "upgrade to watch" on all other TV tiers.
If you're not sure which you have, check your contract and/or bills via your myVM online account. Or check whether you can watch (I'm picking a Maxit-only TV channel completely at random here) Sky Nature HD on Ch279.
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As @japitts states you cannot download the UKTV Play app on TV 360 as all out apps are already preinstalled onto the set top box. As long as you subscribe to the channels in which these shows air on, there should be no reason as to why you can't view them. Log into your online account to check your package and confirm what channels are included here. If the channel is not included in your package, you'll need to purchase the episodes/boxset if you wish to watch them from the 360 set top box.
To add channels or make changes to your package you can customise this here.
Hope this helps. Let us know if you have any further questions.