Here are BBC sites, specifically aimed at pupils of primary age:
French:
http://www.bbc.co.uk/schools/primarylanguages/french/
Spanish
http://www.bbc.co.uk/schools/primarylanguages/spanish/
Mandarin
http://www.bbc.co.uk/schools/primarylanguages/mandarin/
They provide a good start to language learning for beginners.
Taking advantage of what you have at your disposal
Although one cannot rely on this, in many of our schools there are pupils for whom the target language is the mother tongue. This is particularly the case with languages such as French, with which some African pupils are familiar, and Eastern European Languages such as Polish. This can provide teachers with an excellent resource and model of pronunciation. For this to be a success, it is very important that native speaker is given prior notice of the language to be delivered and for the teacher to find a range of activities to consolidate what is presented.
A Skype link to a foreign partner school can be another good way of introducing a target language. If it is effectively planned by both schools, there can be an exchange of language lessons by teachers and opportunities for twinned classes to interact.
The British Council provide help in finding such a link:
https://www.britishcouncil.org/school-resources/partner
There is also the possibility of inviting a native speaker from the community to a class and this can provide very good opportunities for pupils to practice what they have learnt
Using the subscription materials to support the learning of one or more languages
The new UK government advice on Ks2 Foreign Languages in English schools (2014) states that teaching may be of any modern or ancient foreign language, enabling pupils to make progress in one language.
Although this presents challenges to a school pursuing a multilngual, investigative approach, it is not impossible, and may be preferable to maintain such an approach as long as a specific target language for learning has been identified.
As those of us who have used investigating languages materials over the years know, in using the materials, we can make strong links to English and other areas of the curriculum, we can value all languages within our school community, and a teacher, who is not proficient in a foreign language, can deliver the approach based on his or her expertise in English.
Please refer to the curriculum section for suggestions as to how the subscription materials can support the learning of a target language.