This is Britainusa's advice on what to provide. I got as much info as I could and wrote a letter stating each point was covered. Use this as a guide.
As for the Intent of marriage. I got round that by emailing the registrar some little questions and asking if he / she could confirm the date was still available. I printed all the emails off and used that as evidence and supplied the registrars address and a brochure and contact and address for the reception venue. ( you can always book somewhere, get them to send you a quote, then cancel it ) you are not obliged to pay a deposit for quite a few weeks after the booking anyway, just a thought )
Photos of you guys together, his finances as well as yours ( printed statements ) and also I wrote a letter of intension myself for my OH to come over which as far as I was aware was acceptable if you did not have any evidence of marriage plans.
ADVICE FOR APPLICANTS
It is your responsibility to satisfy the Entry Clearance Officer that you meet all the criteria of the category under which you are applying. Therefore, it is in your interest to ensure that you are fully prepared before submitting an application. An Entry Clearance officer will base their decision to issue or refuse on the documents you submit.
PLEASE NOTE THAT THE APPLICATION PROCESSING FEE IS NON-REFUNDABLE IRRESPECTIVE OF THE OUTCOME OF YOUR APPLICATION.
Documentary Requirements
1) Online application
2) Passport (note: It should be the original document and have ample validity)
3) One passport size photograph (Click here for example)
4) Fiance(e)s Passport
If your fiance(e) is a British citizen by birth but does not hold a British passport then a full (long form) British birth certificate giving parents’ names will suffice. A British Visitor’s Passport is not sufficient.
If your fiance(e) is entitled to right of abode in the United Kingdom but travels on a non-British passport, that passport containing the Certificate or stamp of the Right of Abode must be produced.
If your fiance(e) is a foreign national with indefinite leave to remain in the United Kingdom, produce that passport.
If your fiance(e) holds a British citizen passport, produce that passport.
5) Letter Of Support
If your fiance(e) does not attend in person at the time of your application then we require a letter from them to state that:
a) they are aware of and support your application to marry them in the United Kingdom.
b) that each of the parties intends to live permanently with the other as his or her spouse after the marriage has taken place.
6) Date and plans for marriage
Evidence of any arrangements already made for the marriage or a statement of when and where it will take place.
NOTE: In the case of a register office marriage the registrar will not normally supply a letter of confirmation until he/she is satisfied both parties are present in the United Kingdom and free to marry. In this case we request a statement of your intentions only.
7) Termination Of Previous Marriage
(i) divorce papers showing the date the divorce became final;
or/
(ii) divorce papers showing that the divorce is well under way;
or/
(iii) death certificate.

Evidence Of Accommodation
This may come in various forms:
a) Lease or tenancy agreement for private rented property
b) Tenancy agreement with the local authority housing department
c) Mortgage papers for privately owned property
d) Title deeds (OR letter from the organization holding the deeds).
If you plan to stay temporarily with relatives or friends we require a letter from them giving their consent to this arrangement. In addition evidence in the form of (a), (b), (c) or (d) that they have suitable temporary accommodation available for you and your dependants.
NOTE: Under the Rules you must demonstrate that you have the intention and ability to acquire adequate accommodation of your own or which you occupy yourselves (i.e. a separate unit of accommodation. One room in a shared property may not be acceptable other than on a strictly temporary basis).
9) Financial Support
Evidence that you and your fiance(e) can support yourselves and your dependants without recourse to public funds may include one or a combination of the following documents according to your circumstances.
a) Letter from your fiance(e)’s employer in the United Kingdom stating the position in the company, length of service, annual salary and whether the position is permanent.
b) Offers of employment for either/both parties including details of salary.
c) Recent statements of bank and saving accounts showing sufficient means of support while employment is sought in the United Kingdom or for indefinite support if no employment is planned.
d) Educational or vocational certificates and C.V. to demonstrate qualification for potential employment in the area in which you plan to live.
e) References from previous employers.
f) Enquiries made regarding employment in the United Kingdom.
g) Plans for self-employment in the United Kingdom.
KEEP PHOTOCOPIES OF EVERYTHING! YOU MAY NEED INFO FOR THE NEXT VISA.