You need a phone line (even if making no voice calls) in 99.99% of cases for any broadband apart from with Virgin Media cable.
Not sure on current policy from BT on them installing (well 'enabling' if any line exists) a phone line and then you moving to another location, but they tend to have a minimum 12 month rental period and if you skipped off they may try to get the remaining months payment from you (and blackmark your credit rating, or keep any deposit, if they take one) if you [for example] left the country.
I had a phone line installed free last year on condition I pay rental to BT for 18 months and make 10 calls per month (which includes the uncharged calls at weekends), so I have paid for hardly any voice calls but kept to the small print of the contract, if not exactly what they expect [ie giving them some income from speech calls].
For internet access, there are quite a few ISPs which do not require a 12 month (or longer) contract but there would be setup fees of say 50 pounds, plus the cost of a router (which might be free if signing up for 12 months) to add.
All told, a dongle for internet use (excluding iPlayer) would perhaps be best option. If you only have a single machine then a single USB stick would do. If you have a few items such as Kindle, mobile phone, laptop, that all use wireless, then a Three network "MiFi" at about 70 quid would work for up to 3 months or 3 GB of data (whichever came first) and then you'd need to pay for top-ups after that.
If you know soon after moving in that you would be there for 10+ months then I'd suggest going for some phone + internet deal (and pay any penalties for not completing to the end of 12 months) as it won't knock the costs up too much (compared with the initial costs for flexibility of monthly contract). You would probably get significantly faster connection to a wireless router, get the router for a nominal sum (delivery cost) and the biggest cost might be for getting BT to reconnect the line.
No TV included in options above - if you had a landline and some ISP deal, you could download with iPlayer overnight to time-shift programmes and would then need no TV licence (licence small print stipulates that watching live TV or recording it yourself for later viewing, does require licence but watching it from the web 'later' does not). I'm using PlusNet as ISP and they don't count any of the traffic from 00:00 to 08:00 so I download 60-80 GB of TV a month in the night. During the 08:00 to 00:00 'peak' hours they have two tiers, either the 'value' account allowed 10 GB or the 'extra' account (which I use) allowed 60 GB. Other ISPs have other offers.
Hope that isn't too much waffle :)