Template email to MP or local council
Below is a template letter/email to send to your local MP asking them to post about your grant on their social media channels. You could also ask them for a quote for your press release or invite them to your opening event if you are having one. You should be able to find contact details for your MP on their website. 

Dear XX
I am getting in touch to share the good news that we have been awarded £XX of National Lottery funding to INSERT DETAILS OF GRANT. The funding will mean INSERT DETAILS OF WHAT IT WILL ENABLE YOU TO DO. I would be extremely grateful if you would help us share the good news with the local community by posting on Twitter? I have included a suggestion below:
Great news that (insert your Twitter handle or organisation name) has been awarded National Lottery funding to (insert details)
Please feel free to share the news on any other channels. If you would like any more information on our organisation and the work we do please get in touch at any time.
Yours sincerely
TITLE
ORGANISATION NAME