T-SQL and CLR types for return value do not match

Hi I am trying to create a CLR function to call a webservice, the CLR function return data type is double, whether I try to create this as a table valued funcion or a scalar to return a distance travelled value I am receiving the error below. I've tried changing data types around in the CLR side and the SQL side but keep receiving the same error message, any help would be appreciated,
Thank you,

[Microsoft.SqlServer.Server.SqlFunction(Name = "DistanceCalc")]
        public static Double DistanceCalc(Double SrcLat, Double SrcLong,
           Double DestLat, Double DestLong)
            MileageWS ws = new MileageWS();
            ws.Url = "http://test.isp.ca/Distance.asmx";
            int intUom = 0;  // 0 = Mile, 1 = KM

            RouteType RouteMethod = RouteType.Practical;
            Requester RequestedFrom = Requester.LinkRoute;

            Double distance;

            distance = ws.GetDistanceInfoForLonLat(SrcLat, SrcLong, DestLat, DestLong, intUom, RouteMethod, RequestedFrom);
            return distance;

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	@SrcLat as float, @SrcLong as float, 
	@DestLat as float, @DestLong as float
RETURNS TABLE (Distance float)
External NAME CLRfunctions.RIFunctions.DistanceCalc

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Error received when try to Create function ...

Msg 6551, Level 16, State 2, Procedure pcMiler, Line 6
CREATE FUNCTION for "pcMiler" failed because T-SQL and CLR types for return value do not match.

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David Johnson, CD, MVPOwnerCommented:
Table of T-SQL data types, and CLR Equivalents
 SqlDouble  and Double in your instance

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Scarlett72Author Commented:
I also had to create it as a scalar function, thanks!
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Microsoft SQL Server 2008

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