Option 1:
If the TVs have got 'AV' sockets, you can buy a cheap 'Scart-to-AV' lead which will enable you to connect the output of a standard Freeview box to the input of the TV. (Simply press 'AV' on the TV handset, to switch to the appropriate 'channel' on the TV)..
The only problem with this method is that most older TVs only had mono sound inputs. That means that you can only connect either the left or right stereo channel into the TV. (i.e. there are two audio plugs on the lead but only one audio socket on the TV). In practice, this doesn't normally cause much of a problem. I've got an old Commodore computer monitor connected to a Freeview box in this way; my friend has got his TV connected in the same manner. There's no noticeable problem with the sound, except possibly when watching something like a large orchestra on 'The Proms'.
Option 2:
You can buy an 'RF modulator' to go between a standard Freeview box and the TV. This converts the 'AV' signal, from the Freeview box, to radio frequency signals which enables you to connect the modulator to the aerial socket of the TV. (The TV may have to be tuned to recognise the signal, in the same way that you used to have to tune them to accept a signal, into the aerial socket, from a VCR).
http://www.maplin.co.uk/Module.aspx?ModuleNo=3 3050&ForceUpdate=Y
Option 3:
You can buy a special type of Freview box that's got an RF modulator already built into it. These can be hard to find; hardly any shops stock them. The cheapest one I know of online is the Humax F2-FOX T:
http://www.empiredirect.co.uk/content/products /details/?modelcode=HUM-F2FOXT
(The specification on that page do